Certified Professional Horticulturist (CPH) Practice Exam 2026 – Your All-in-One Guide to Certification Success! – All Questions

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Avoiding Lawn Disease: The Key Role of Fertilization and WateringWhat lawn management strategy is likely to promote lawn disease?Avoiding Noxious Weed Seeds in Grass Seed PurchasesWhen purchasing prepackaged grass seed, one should avoid seed that contains:Caring for Your Impatiens: A Guide to Perfect PlacementA customer tells you that they planted Impatiens in full sun next to the driveway. The plants look great in the morning but terrible in the late afternoon. What is the likely cause of the problem?Choosing the Right Cool Season Turf Grass: Why Kentucky Bluegrass is Your Best BetWhich species of grass is best suited as cool season turf, well adapted to good soil in full sun?Choosing the Right Growing Medium for Containerized PlantsWhich growing medium formulation should you select for long term use for containerized plants?Choosing the Right Plants for Your Garden: Key Factors to ConsiderWhat is an important consideration when selecting plants for a garden?Choosing the Right Site for Growing In-Ground Nursery StockWhich of the following is important when selecting a site for growing in ground nursery stock?Choosing the Right Soil Amendment for Potted PlantsWhat soil amendment is most appropriate for providing increased nutrients to the roots during potting?Choosing the Right Tree for Screening: What You Need to KnowWhich of the following should you consider when selecting a tree for screening purposes?Compost: The Unsung Hero of Organic Matter in HorticultureWhat is the most effective and longest lasting source of organic matter?Cracking the Code: Understanding Pesticide Hazard LabelsWhich label must appear on a pesticide that identifies the maximum potential hazard to the applicator's health?Creating Ideal Indoor Environments: The Importance of Air Circulation for Plant GrowthWhich environmental factor can significantly affect plant growth indoors?Discovering the Best Way to Space Herbaceous AnnualsOn average, how can the proper spacing of herbaceous annuals be determined?Enhancing Soil Quality: The Power of Organic Matter and CompostWhich practice is effective in improving soil quality and nutrient availability?Essential Care Tips for Thriving Hanging BasketsWhat two plant care practices need to occur more frequently with hanging baskets than with larger containers on the ground?Essential Strategies to Manage Soluble Salts in Container PlantsHow can you prevent the buildup of soluble salts in plant containers?Establishing a New Lawn: Your Ultimate Guide to Planting MethodsWhat are the planting methods used to establish a new lawn?Establishing Robust Turf: The Essential Conditions You NeedTurf is best established and maintained on ground that is:Exploring the World of Annuals: Heavy Feeders in Your GardenWhat are annuals?Finding the Perfect Mulch Depth for Thriving PlantsHow deep should the mulch be around plants for optimal growth?Finding the Perfect Root Ball Diameter for Trees and ShrubsWhat is the best diameter for a root ball when root pruning a tree/shrub with a stem diameter of 3 inches?Getting Started with Your Vegetable Garden: The Importance of Soil TestingWhat is the first step in preparing an area for a vegetable garden?Harnessing Natural Breezes: A Smart Energy Conservation StrategyWhich of the following is an example of energy conservation within a landscape?Harnessing Nature: How Sun and Wind Shape Energy ConservationWhich two environmental factors have the greatest impact on energy conservation?Herbicides: The Go-To Solution for Tough Weed Control ChallengesWhich weed control method is recommended when all other means are impractical?How Crop Rotation Can Revolutionize Your Soil HealthWhich of the following practices improves soil health?How Deep Should You Plant Bulbs for Optimal Growth?How deep should you plant bulbs?How Organic Matter Boosts Water Retention in Sandy SoilsWhat can enhance the water holding capacity of sandy soils?How to Care for Tropical Indoor Plants During Heating SeasonMost indoor plants are tropical. What practice should be followed for these plants during the heating season?How to Know When Your Compost is Ready to UseCompost is ready when:How to Plant Like a Pro: Understanding the Right Hole Size for Your PlantsWhen planting a plant, how much larger than the root ball should the diameter of the hole be?How to Safely Transport Trees and ShrubsWhen transporting a tree or shrub in an open vehicle, what should you do to protect the plant?How to Tackle Purplish Leaves: A Guide for Aspiring HorticulturistsWhat is the best recommendation to fix a nutrient deficiency when plants have purplish leaves?How Visual Perception Shapes Your World: Insights for the CPH ExamWhat percentage of our impressions are made by sight?Improving Soil Structure: The Power of CompostWhich method can effectively improve soil structure and aeration over time?Japanese Beetles: The Lawn's Worst NightmareWhich of these insects have the potential to cause lawn damage and should be controlled immediately?Know What Must Be on Nursery Tags for Plant PurchasesBy law, nursery tags must have this information on them:Mastering Container Gardening: Essential Growing RequirementsWhich growing requirements differ between plants grown in containers in the landscape?Mastering Container Gardening: The Importance of Soil Type and DrainageWhich of the following is essential for successful container gardening?Mastering Container Plant Care: The Key to Thriving GreensWhat is the number one cause of death for plants that are growing in containers?Mastering Disease Control in Your Vegetable GardenWhat is the best way to control diseases in a vegetable garden?Mastering Effective Nursery Displays for Garden EnthusiastsWhich of the following best describes effective nursery displays?Mastering Groundcovers for Low-Maintenance LandscapingGroundcovers are used most frequently in areas requiring minimal maintenance. Which practice is an example of this?Mastering Indoor Plant Care: Watering Essentials for SummerDuring the summer, how often should most indoor plants typically be watered?Mastering Lawn Care: The Art of Proper WateringHow should one properly water the lawn?Mastering Lawn Establishment: The Essential Role of PhosphorusWhen establishing a lawn, which fertilizer element is important in producing a stronger root and faster top growth of grass seedlings?Mastering Merchandising: The Best Spots for Point of Purchase DisplaysWhere should the Point of Purchase displays be located?Mastering Moisture: The Key to Your Compost Pile SuccessWhat is the suggested moisture percentage for an ideal compost pile?Mastering Mulch: The Key to Healthy In-Ground OrnamentalsWhat is the recommended thickness for applying mulch around in-ground ornamentals?Mastering Nutrient Lockout: The pH Puzzle in HorticultureWhich of the following factors most commonly contributes to nutrient lockout in plants?Mastering Root Ball Techniques: A Guide to Preventing Girdling RootsUsing a knife to cut a root ball that is surrounded by a mass of roots prevents the formation of which type of roots?Mastering Scientific Plant Names: A Horticulturist's GuideWhich is the proper way to write the scientific name of a plant?Mastering Soil Erosion Prevention with No-Till FarmingWhich of the following practices helps to prevent soil erosion?Mastering the Art of Horticultural SalesThe major strengths of a good salesperson are:Mastering the Art of Plant Division for Thriving GardensWhat technique is recommended for thinning out overcrowded plants?Mastering the Art of Transplanting Vegetables in Your GardenWhat pre-preparation actions should be completed when transplanting vegetables into the garden?Mastering the Art of Watering PlantsWhat is the best method for watering plants?Mastering the Design Process: Key Steps for Aspiring HorticulturistsWhich of the following identifies the first three steps in the design process?Mastering Watering Practices for Healthy PlantsWhat is one of the key indicators of correct watering practices for plants?Mastering Weed Control: The Importance of IdentificationWhat is the first step in selecting the best method of weed control?Mastering Weed Management: The Role of Pre-Emergent HerbicidesWhich herbicide must be applied before weed seeds germinate?Maximizing Impulse Purchases: Strategic Item PlacementWhere should items that customers typically purchase on impulse be placed?Maximizing Solar Energy: The Importance of Landscape DesignTo maximize solar energy for heating, should landscapes allow full sun to all sides of a home during winter?Navigating Overwatering: The Hidden Dangers of Nutrient Leaching in Container GardeningWhat irrigation problem could result from overwatering at the end of a container bed?Navigating Plant Nutrients: The Nitrogen DilemmaOverapplication of which plant nutrient is likely to increase sucking insect problems?Navigating Plant Water Needs: Understanding the Permanent Wilting PointWhat is the stage where a plant cannot recover from loss of water?Navigating the World of Ideal Soil CompositionWhat composition best describes the ideal soil?Nurturing Growth: The Impact of Water Quality and pH on Plant HealthWhat factors are most likely to influence nutrient availability and impact plant growth?Nutrient Management in Horticulture: Unlocking Plant PotentialWhat is the primary goal of nutrient management in horticulture?Ornamental Trees vs. Shrubs: Understanding the Key DifferencesWhat defining feature helps distinguish between ornamental trees and shrubs?Peat Moss: The Secret Ingredient for Thriving Container PlantsWhat amendment should comprise ½ to 2/3 of the potting medium for containerized plants?Pinching back is the best fix for a leggy succulent and how it helpsYou have an outdoor succulent that has become long and spindly. What combination of actions is suggested to improve its condition?Protecting Your Plants from Frost: The Best TechniquesWhat technique is commonly used to protect plants from frost in colder months?Soil pH: The Key to Selecting Healthy PerennialsWhen selecting perennials, which factor is important for determining its growth?Spotting Aphids: A Guide for Aspiring HorticulturistsA customer brings in a leaf from their hibiscus plant with a sticky substance and louse-like insects. What pest might this indicate?Spotting Major Pests: The Case of Aphids in Vegetable GardeningWhich of the following is considered a major pest for vegetable crops?Spotting Nutrient Deficiencies in Plants: Yellowing Leaves ExplainedWhich is a common sign of nutrient deficiency in plants?Start Composting at Home: Your Easy GuideA customer in the garden department explains that they want to start composting their yard and household waste, but the compost starter inoculant is not available. What should you tell them?The Best Fertilizer Choice for Slow-Release ApplicationsWhich type of fertilizer is best for slow-release application?The Best Locations for Planting Broadleaf Evergreens in Your GardenOn which side of a house should broadleaf evergreens such as rhododendrons, azaleas, camellia, and holly be planted to protect them?The Best Time to Tackle Weeds for a Thriving GardenWhat is the best time to control weeds in a garden?The Best Time to Water Your Lawn for Optimal GrowthWhen is the best time to water your lawn?The Best Way to Greet a CustomerWhat is the best way to greet a customer?The Essential Guide to Mulching: A Gardener's Secret WeaponWhat is the function of mulching in gardening?The Essential Guide to Plant Hardiness in Landscape DesignIn landscape design, what is the primary consideration for plant selection?The Essential Guide to Preferred pH Levels for Garden PlantsWhat is the preferred pH range for most garden plants?The Essential Role of Mulching in LandscapingWhat is the purpose of mulching in landscaping?The Hidden Benefits of Using Organic Fertilizer for Indoor PlantsWhat is a benefit of using organic fertilizer for indoor plants?The Hidden Dangers of Honeydew: Understanding Sooty MoldWhich of the following is a likely consequence of allowing the honeydew-like sticky substance produced by sucking insects to remain?The Impact of Weather on Plant Water LossWhich environmental factor has the greatest influence on water loss from plants?The Importance of Fertilization in HorticultureWhat is the primary purpose of fertilization in horticulture?The Importance of Soil pH for Plant Health and GrowthWhat is the main purpose of maintaining a proper pH level in the soil?The One-Third Rule: Mowing Your Lawn for Health and VigorWhen mowing a lawn, how much of the leaf blade is recommended to be removed?The Perfect Soil pH for Vegetable Growth: What You Need to KnowBased on the optimum growth needs of vegetable plants, which soil pH range is recommended?The Power of Sanitation in Horticulture: Your Shield Against Pests and DiseasesWhat is the most important maintenance step for avoiding disease and pest infestations?The Real Benefits of Conservation Landscaping Beyond AestheticsDo landowners benefit from conservation landscaping only because it looks good?The Right Temperature: Key to Compost SuccessWhat is the ideal temperature range for composting to effectively break down materials?The Secret Life of Plants: Nurturing Growth in Your LandscapeWhich practice can help enhance the growth of plants in a landscape?The Secret to Pest and Disease Prevention in HorticultureWhat is the most important maintenance step for avoiding disease and pest infestation?The Secrets of Supercooling: How Plants Survive the ColdA process whereby plant fluids do not freeze is known as:The Surprising Truth About Saving Your Own Vegetable SeedsWhat is the consequence of saving and planting your own vegetable seeds?The Value of Newly Developed Vegetable Varieties in GardeningWhat is the primary benefit to purchasing newly developed vegetable varieties?Timing Your Fertilizer: A Guide for Hardy Ornamental PlantsWhen should one fertilize hardy ornamental plants to avoid winter damage?Trees are essential for creating a microclimate in your landscapeWhich plant material is best for creating a microclimate?Understanding Aphids: The Live-Bearing Pest You Need to KnowWhich pest will produce living young instead of laying eggs, enabling it to build large populations quickly?Understanding Clay: The Smallest Soil Particle and Its Role in HorticultureWhich of these soil types has the smallest particle size?Understanding Cold Acclimation in Plants: Preparing for WinterCold acclimation generally follows a two-stage pattern. Which of the following would stimulate the pattern?Understanding Cultural Weed Control Methods in HorticultureWhat is not a common cultural weed control method?Understanding Essential Nutrients for Plant GrowthWhich of the following are primary nutrients considered essential for plant growth?Understanding Extracellular Ice Formation: A Key to Plant SurvivalWhat is the process called when water removed from cells during freezing is reabsorbed during thawing without injury?Understanding Fertilization Needs for Well-Established TreesHow often should well-established trees generally be fertilized?Understanding Herbaceous Plant Classifications: Your Guide to Annuals, Biennials, and PerennialsHerbaceous plants are classified by the way in which they complete their life cycle. What are the classifications?Understanding Indoor Plant Care: The Impact of Low Humidity on Leaf DropWhich indoor plant condition is most commonly associated with low humidity?Understanding Intracellular Ice Formation and Its Impact on Herbaceous PlantsWhich types of plants are more likely to be injured by intracellular ice formation?Understanding Intracellular Ice Formation: A Critical Concept for HorticulturistsWhat term describes rapid freezing and formation of ice crystals within plant cells?Understanding Iron Deficiency in RhododendronsA client seeks advice because their rhododendrons have yellowing newest leaves. What nutrient deficiency might this indicate?Understanding Irrigation Needs: Why Lawns Require More WaterWhich of the following landscape features traditionally requires the most frequent irrigation?Understanding Leaf Functions: The Role of Photosynthesis and TranspirationWhich of the following functions are not performed by leaves?Understanding Maryland Seed Law: The 9-Month Marketing RuleIn accordance with Maryland seed law, how long may seed be marketed after being tested?Understanding Monocots: The Key to Plant IdentificationA customer hands you a plant with parallel leaf veins. What type of plant is it?Understanding Nursery Inspection Tickets: What Every Horticulturist Should KnowWhich of the following is true regarding nursery inspection tickets?Understanding Odors in Compost: A Guide for Aspiring HorticulturistsAn active compost with a pungent odor is an indication that the compost is not getting enough...Understanding Organic Matter in HorticultureOrganic matter comes from decaying plants and animals as well as animal excretions, but also includes:Understanding Pesticide Safety Before TreatmentWhat should be done before spraying, dusting, or fumigating for insects?Understanding Plant Acclimation: Essential Insights for Aspiring HorticulturistsThe period of acclimation for a plant to adjust to indoor conditions may range in length, but it's usually:Understanding Plant Disease Transmission: The Role of Piercing-Sucking InsectsWhich method is known to transmit bacterial and viral disease?Understanding Plant Disease: Common Causes for Indoor PlantsWhich of the following are common causes of plant disease on interior plants?Understanding Plant Health: Tackling Purplish LeavesA garden center customer claims that their plants do not seem to be growing well with purplish leaves. What is the best recommendation?Understanding Purplish Leaves: A Sign of Phosphorus DeficiencyWhat condition is often indicated by purplish leaves on a plant?Understanding Root Pruning for Healthier PlantsWhat is the most likely result of root pruning plants that are grown in the ground?Understanding Root Rot: Identifying Signs in Your PlantsWhat is a common sign of root rot in plants?Understanding Roots: Vital Functions Beyond Protein ProductionWhich of the following is NOT a primary function of the roots?Understanding Soil Drainage: The Heart of Landscape DesignWhich of the following factors is crucial for plant survival in landscape design?Understanding Soil pH: A Key Indicator for Healthy HorticultureWhat is a common indicator of soil health in horticulture?Understanding Soil pH: The Essential Guide for HorticulturistsWhich method is best for determining soil pH?Understanding Soil pH: The Key to Nutrient AvailabilityWhat is a key factor in the availability of nutrients in soil?Understanding Soluble Salts and Root Desiccation in Container PlantsYou have just identified an accumulation of soluble salts and root desiccation in a customer's container plant. What is the probable cause?Understanding the Aerobic Process of Composting for Aspiring HorticulturistsComposting is an ______________ process requiring a constant supply of Oxygen.Understanding the Cambium: The Key Layer in Plant GrowthWhat is the name of the layer of tissues located between the xylem and the phloem?Understanding the Effects of Excessive Mowing on Plant HealthWhat is the likely impact of mowing too much leaf blade?Understanding the Essentials: Non-Mineral Elements in Plant GrowthWhich three non-mineral elements do plants primarily use?Understanding the Growing Needs of Container vs. Landscape PlantsWhich growing requirements differ between plants grown in containers and those in landscape?Understanding the Impact of Callery Pear in Reforestation EffortsWhich statement best describes the impact of using Callery Pear for reforestation?Understanding the Key Differences Between Sedges and GrassesHow do sedges differ from grasses?Understanding the Lifecycles of Perennials and BiennialsWhat is a common characteristic of perennials and biennials?Understanding the Perfect Temperature for Composting SuccessA properly functioning compost pile should be how many degrees?Understanding the Private Applicator License Under FIFRAUnder the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA), which license is required to apply these chemicals to your own property?Understanding the Relationship Between Water Pressure and Elevation ChangesWhat is the PSI change of traveling water based on elevation?Understanding the Role of Microorganisms in Soil HealthSoil is made up of organic matter, inorganic matter, air, water, and...Understanding the Signs of Over-Fertilization in PlantsWhat is a common sign of over-fertilization in plants?Understanding the Signs of Overwatering in Indoor PlantsWhat is a common sign of overwatering in indoor plants?Understanding the Vulnerability of Herbaceous Plants to Ice InjuryWhich types of plants are more likely to be injured by intracellular ice formation?Understanding Water Alkalinity: The Key to Buffering AcidityWater alkalinity measures the ability of water to stabilize or buffer which of the following?Understanding Water Flow in Irrigation Systems: Key InfluencesWhat influences the rate of water flow in an irrigation system?Understanding Water Needs for Trees, Gardens, and LawnsDuring active growth, how much water do most trees, gardens, and lawns need per week?Understanding What Can't Be Compost: Your Guide to Composting EffectivelyWhat type of organic material cannot be composted?Understanding What Causes Brown, Crispy Petals on Your Potted PlantsIf your customer's potted plant has brown, crisp petals, what could be causing it?Understanding Why Your Potted Ivy Might Stop GrowingWhat could be a reason for a customer's potted ivy to stop growing?Understanding Windrows in Commercial CompostingCommercial composting is typically done by laying out compostables in long rows called?Understanding Zoysia: The Grass That Doesn't Play by Seed RulesWhich type of grass must be planted by vegetative means because its seed does not produce plants that are true to type?Unlocking the Meaning of BMP in HorticultureWhat does BMP stand for in horticulture?Unlocking the Secrets of Mulching: Why Pine Bark and Compost MatterWhat is an essential benefit of using pine bark and compost as mulch around ornamentals?Unlocking the Secrets of Soil pH for Plant HealthWhy is soil pH important for plant health?Unraveling the Role of Calcium in Plant Cell WallsWhich element is the principal component in cell wall development?Watering Wisdom: The Key to Thriving Vegetable GardensWhat is the least amount of water required in a vegetable garden for optimal growth?Watering Wisely: Understanding Dormant and Active Plant NeedsHow frequently should dormant plants be watered compared to active growth plants?What You Should Know About Nutrient Management PlansSince 1999, agricultural producers have had to file a nutrient management plan. What is the purpose of this plan?When a shade-loving plant is moved into full sun, photosynthesis is immediately affectedIf a shade-loving plant is moved into full sunlight, what plant process would be adversely affected immediately?When to Re-Pot Your Plants for Optimal GrowthWhen is the best time to re-pot a plant?Why Annuals Are the Go-To for Quick Garden ColorWhich type of herbaceous ornamental plant is used for quick growth and early color in a garden setting?Why checking the pH of well water comes first in plant careWhat is the first step in watering your plants with well water?Why Client Interviews Are the Heart of Landscape DesignTo ensure that you will provide a good landscape design, you should first:Why Contact Miss Utility 811 Before Digging?Which agency should you contact before any digging work?Why Indoor Plants Require Less Fertilizer Than Outdoor PlantsWhy do interior plants require less fertilizer than outdoor plants?Why Limiting Plant Species is Key to Successful LandscapingWhen selecting plants for landscaping, what is the most important reason for limiting the number of plant species?Why Magnesium is a Plant’s Best FriendWhich nutrient is crucial for the production of chlorophyll?Why Mulching is a Garden Game-ChangerWhat is the benefit of mulching in a garden?Why Non-Native Plants Can Overrun Our EcosystemsWhat is a major factor that makes non-native plants invasive?Why Organic Mulch is Your Best Friend in Weed ControlWhich type of mulch is considered beneficial for weed control?Why Perlite is Essential for Healthy Plant GrowthWhat is the role of perlite in potting mixes?Why Personal Interactions Matter in Horticulture SalesWhich source is considered a valuable resource for customer information?Why Reading the Pesticide Label Matters for HorticulturistsBefore fumigation, spraying, dusting, or fogging plants to treat insect problems, always remember to:Why Slow-Release Fertilizers Are Key in Nutrient ManagementWhich fertilizer formulations are best suited to address nutrient management regulations?Why Soil Testing is Key to Successful GardeningWhat is the primary purpose of testing soil before planting?Why Sunlight Exposure is Key when Planting TreesWhich environmental factor is most critical to consider when planting trees?Why Understanding Invasive Plants is Crucial for HorticultureWhich option is NOT a characteristic of invasive plants?Why Weeds Are the Arch-Nemesis of Your GardenWhat is the major reason weeds are considered to be undesirable in the landscape?Why Weeds are the Uninvited Guests in Your GardenWhat is the major reason weeds are considered to be undesirable in the landscape?Why You Should Think Twice Before Composting Cat ManureWhich material is not suitable for composting?Why Your Indoor Plants Need Drainage Holes in Their PotsWhy should indoor plants be potted in containers with holes at the bottom?Why Your Workforce is the Hidden Gem of Your BusinessWhich of the following is the most overlooked asset of any company?Winterizing Your Garden: Overwintering Tender Plants SuccessfullyWhich condition is often crucial for successfully overwintering tender plants outdoors?

More practice questions

These questions are part of the practice quiz. Start practicing

What are the most common indoor plant problems?
Which nutrient's runoff is of the greatest concern in Maryland?
In landscape design, which is a primary purpose of using contouring?
When is knowledge of common plant names more useful than the scientific names?
What soil amendment should be recommended for improving a potting mix for cacti?
Which of the following plants has a flower that has both male and female parts?
What type of mulch helps retain moisture and improve soil temperature?
What factors should good landscape design consider?
A protective measure for in-ground ornamentals is the use of pine bark, compost, fir bark, or pine needle mulch. What is the recommended depth to which the mulch should be applied?
Heavy soils are best improved by adding:
If the Carbon to Nitrogen Ratio of a compost pile is currently 10/1, what should you add to balance it?
Horticulture oils may be applied at any time of the year except when the temperature is:

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