Answer: B. Health, form, or flowering. Pruning can support plant health, shape, safety, and flower or fruit development.
Which branches are commonly removed to improve plant health?
A Every branch with leaves
B All young branches
C Branches facing north
D Dead, diseased, or damaged branches
Answer: D. Dead, diseased, or damaged branches. Removing dead, diseased, damaged, or rubbing branches can improve plant condition.
What can happen when branches repeatedly rub together?
A Wounds and damage can develop
B Roots stop absorbing water
C Flowers change color
D Soil pH rises
Answer: A. Wounds and damage can develop. Rubbing branches can injure bark, so one may need removal.
Which pruning cut removes an entire branch at its origin?
A A root cut
B A flush cut
C A thinning cut
D A topping cut
Answer: C. A thinning cut. A thinning cut removes a branch at its point of origin.
Where should a tree branch’s final pruning cut be made?
A Flush against the trunk
B Several feet from the trunk
C Just outside the branch collar
D Through the trunk
Answer: C. Just outside the branch collar. Cut just outside the branch collar to preserve the tree’s natural protective tissue.
Why should the branch collar remain intact?
A It supports natural wound closure
B It produces fertilizer
C It attracts pollinators
D It prevents all insects
Answer: A. It supports natural wound closure. The collar contains tissues involved in the tree’s natural response to a pruning wound.
What is a problem with cutting a branch flush to the trunk?
A The branch grows faster
B Roots absorb too much water
C The tree gains new flowers
D The collar may be damaged
Answer: D. The collar may be damaged. A flush cut can remove the branch collar and interfere with natural wound closure.
Why should long branch stubs be avoided?
A They improve the tree’s shape
B They can invite health problems
C They strengthen every branch
D They increase soil nutrients
Answer: B. They can invite health problems. Stubs may die back and can contribute to tree health problems.
What does topping a tree involve?
A Removing much of its crown
B Trimming only small roots
C Removing fallen leaves
D Thinning a garden bed
Answer: A. Removing much of its crown. Topping removes large amounts of a tree’s crown and is harmful.
Why is topping trees discouraged?
A It improves natural form
B It prevents all disease
C It strengthens branch unions
D It creates weak, stressed growth
Answer: D. It creates weak, stressed growth. Topping can stress trees, disfigure their shape, and encourage weak growth.
In UMN guidance, when is routine pruning best for many trees and shrubs?
A Peak summer heat
B Late dormant season
C During spring flowering
D After autumn leaf drop always
Answer: B. Late dormant season. Late winter to early spring is recommended for many plants, though timing varies by species.
When should many spring-flowering shrubs be pruned?
A Before winter buds form
B During the first frost
C After their flowers fade
D While flowers are opening
Answer: C. After their flowers fade. Spring bloomers often set buds on older growth, so prune after flowering.
Why can pruning a spring bloomer before flowering reduce its display?
A It makes roots dormant
B It dries the soil
C It raises soil pH
D It may remove flower buds
Answer: D. It may remove flower buds. Many spring-flowering shrubs carry buds formed on the previous year’s growth.
When can shrubs that bloom on new growth often be pruned?
A Before spring growth starts
B Only while flowering
C During severe frost
D After leaves fall every time
Answer: A. Before spring growth starts. Some shrubs flower on new growth and can be pruned in spring before growth begins.
What should guide pruning timing for a particular plant?
A The color of the pruners
B The fence height
C Species and flowering habit
D A fixed date for all
Answer: C. Species and flowering habit. Pruning timing depends on species, growth habit, and disease risks.
Why is timing important when pruning diseased trees?
A It changes flower color
B It can reduce infection risk
C It stops all sap flow
D It controls soil drainage
Answer: B. It can reduce infection risk. Pruning at appropriate times can reduce certain disease risks.
What should be done to tools before pruning?
A Soak them in fertilizer
B Paint their handles
C Store them outdoors
D Clean and sharpen them
Answer: D. Clean and sharpen them. Clean, sharp tools produce smoother cuts and help reduce disease spread.
How can gardeners reduce disease spread between plants?
A Sanitize tools after diseased cuts
B Share unclean shears
C Leave sap on blades
D Prune every plant wet
Answer: A. Sanitize tools after diseased cuts. Clean tools after cutting diseased material and between affected plants as appropriate.
Why are sharp pruning tools useful?
A They prevent all regrowth
B They increase fertilizer strength
C They make cleaner cuts
D They eliminate plant disease
Answer: C. They make cleaner cuts. Sharp tools make cleaner cuts than dull tools.
Which tool suits small, thin branches?
A A shovel
B Hand pruning shears
C A rake
D A watering wand
Answer: B. Hand pruning shears. Hand pruners are suited to smaller branches within their cutting capacity.
What can give leverage on thicker branches?
A A leaf rake
B Lopping shears
C A hand trowel
D A seed dibber
Answer: B. Lopping shears. Long-handled loppers provide leverage for larger branches than hand pruners.
Which tool is commonly used for still larger branches?
A A garden hose
B A soil fork
C A pruning saw
D A bulb planter
Answer: C. A pruning saw. A pruning saw is appropriate for larger branches beyond pruner capacity.
How should gardeners choose a pruning tool?
A Match tool to branch size
B Use the largest tool always
C Choose by handle color
D Use shears for trunks
Answer: A. Match tool to branch size. Choose a tool designed for the branch size and keep within its rated capacity.
What can an undercut help prevent when removing a heavy limb?
A Excess flower production
B Soil compaction
C Root exposure
D Bark tearing
Answer: D. Bark tearing. A three-cut method helps keep a heavy limb from tearing bark as it falls.
Which conditions can increase the spread of some pathogens during pruning?
A Cool shade
B Dry mulch
C Wet weather
D Bright labels
Answer: C. Wet weather. Wet conditions can favor pathogen spread; avoid pruning when plants are wet if possible.
Why step back and inspect the plant while pruning?
A Increase root depth
B Maintain a balanced shape
C Check soil pH
D Measure rainfall
Answer: B. Maintain a balanced shape. Looking at the whole plant helps preserve its natural form and balance.
What is a safer general approach when the amount to remove is uncertain?
A Remove every long branch
B Cut the whole crown
C Shear all plants equally
D Prune conservatively
Answer: D. Prune conservatively. Over-pruning can stress plants; remove only what is needed for the goal.
How should rubbing branches usually be handled?
A Remove one suitable branch
B Tie them tightly together
C Cut both at midpoints
D Leave damaged bark untreated
Answer: A. Remove one suitable branch. Selective removal of one branch can reduce repeated rubbing.
Where should a branch be cut to preserve natural form?
A Halfway along every branch
B At the tree’s trunk center
C At its point of origin
D Above the soil line
Answer: C. At its point of origin. Thinning cuts remove a whole branch at a suitable junction or its origin.
How should a hedge be shaped to help its lower leaves?
A Wider only at the top
B Narrow at the base
C Round every side equally
D Wider at the base
Answer: D. Wider at the base. A hedge wider at the bottom lets more light reach lower foliage.
What is renewal pruning for an older multi-stem shrub?
A Cutting every root
B Removing some oldest stems
C Removing all leaves
D Topping a single trunk
Answer: B. Removing some oldest stems. Renewal pruning removes some older stems near ground level to encourage new growth.
In a gradual renewal plan, how much of the oldest stems may be removed yearly?
A Up to about one-third
B All stems every year
C Exactly half each month
D One branch per season
Answer: A. Up to about one-third. UMN Extension describes removing up to one-third of older stems each year.
Which healthy shrub may tolerate hard rejuvenation pruning?
A A newly planted seedling
B A young evergreen pine
C A flowering annual
D An overgrown multi-stem shrub
Answer: D. An overgrown multi-stem shrub. Rejuvenation cuts suit some healthy, neglected, multi-stem deciduous shrubs.
What may happen to blooms after hard rejuvenation pruning?
A Flowers double immediately
B Roots stop growing
C Current-season flowers may be lost
D Foliage becomes evergreen
Answer: C. Current-season flowers may be lost. Severe rejuvenation may sacrifice the current season’s flowers while restoring the shrub.
Why do many evergreens need only limited pruning?
A Their natural form is desirable
B They have no living branches
C They never produce new growth
D They cannot be pruned
Answer: A. Their natural form is desirable. Many evergreens need little pruning; remove defects while respecting their growth habits.
How should pruning of different conifers be planned?
A Use one method for all
B Follow their growth habits
C Cut every tip yearly
D Prune only in midsummer
Answer: B. Follow their growth habits. Conifer types respond differently, so tailor pruning to the species.
What is a heading cut commonly made to do?
A Remove a whole root
B Cut a branch collar flush
C Shorten part of a shoot
D Remove all tree foliage
Answer: C. Shorten part of a shoot. A heading cut removes part of a shoot and can stimulate branching below it.
When making a cut above a bud, which direction may the new shoot follow?
A The bud’s facing direction
B The nearest root
C The branch’s oldest scar
D The wind direction
Answer: A. The bud’s facing direction. A new shoot commonly grows in the direction the selected bud faces.
Why is moderate pruning useful when training a young tree?
A Remove all side branches
B Keep every branch crossing
C Prevent trunk growth
D Build a strong structure
Answer: D. Build a strong structure. Formative pruning can help develop a strong branch framework.
What kind of branches are often removed during young-tree training?
A All outward-facing branches
B Dead, broken, or crossing
C Every short branch
D All healthy lower limbs
Answer: B. Dead, broken, or crossing. Early structural pruning focuses on damaged, crossing, or rubbing branches.
Which tool-cleaning step matters after removing diseased branches?
A Clean tools between plants
B Wipe blades on leaves
C Store them while wet
D Reuse unclean blades
Answer: A. Clean tools between plants. Cleaning tools between diseased plants reduces the chance of spreading pathogens.
Why should wound paint not be applied automatically after pruning?
A It replaces the branch collar
B It guarantees disease control
C It is usually unnecessary
D It seals every insect
Answer: C. It is usually unnecessary. Proper timing and cuts are generally more important; wound dressings are not routinely needed.
What should homeowners do about large, hazardous tree limbs?
A Climb with household scissors
B Consult a qualified arborist
C Pull them down by hand
D Cut from beneath them
Answer: B. Consult a qualified arborist. Large or hazardous tree work can require professional equipment and training.
What should be avoided when pruning near overhead utility lines?
A Using clean hand pruners
B Removing a dead twig
C Inspecting the plant
D Working close to the wires
Answer: D. Working close to the wires. Keep away from power lines and contact the utility or a qualified professional.
Why is removing dead branches useful even when shaping is not the goal?
A It removes damaged material
B It guarantees more flowers
C It changes soil acidity
D It stops all insects
Answer: A. It removes damaged material. Removing dead or damaged branches is a common plant-health maintenance practice.
What can pruning do for a dense hedge?
A Replace watering
B Prevent all pests
C Maintain its intended form
D Change its species
Answer: C. Maintain its intended form. Regular, appropriate trimming can maintain a hedge’s intended shape and density.
When should leggy houseplant stems be cut to encourage fuller growth?
A At the soil line always
B Through the stem base
C Far below all leaves
D Just above a leaf node
Answer: D. Just above a leaf node. Light pruning just above a leaf node can encourage new shoots.
What kind of cut can leave a ragged wound?
A Clean cut near collar
B A cut from dull tools
C A proper thinning cut
D Smooth cut above bud
Answer: B. A cut from dull tools. Dull or damaged tools can create ragged cuts that may invite disease.
Which principle best summarizes responsible pruning?
A Prune heavily on fixed dates
B Top plants to control height
C Use correct timing and cuts
D Remove all old growth
Answer: C. Use correct timing and cuts. Prune for a clear purpose, using plant-specific timing and proper cuts.
Why can sap visibly flow from some trees after late-winter pruning?
A Roots stop functioning
B Leaves become frostproof
C Branches grow without buds
D Sap flows from open cuts
Answer: D. Sap flows from open cuts. Some species bleed sap after pruning; this usually causes little harm but may be avoided by pruning at species-appropriate times.