Pruning. Pruning: What is it? 2/21/2013. What is Pruning? Pruning is the removal of: What do YOU think?
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1 Pruning presentation and activities prepared by Andrea Burke Cornell University Department of Horticulture Pruning: What is it? What do YOU think? What is Pruning? Pruning is the removal of: A) flowers past their prime B) dead, broken, or diseased branches on a tree C) roots in a potted plant overgrowing their pot D) branches on a shrub that are crossing and chafing E) A, B, C, and D F) just B and D 1
2 What is Pruning? Pruning is the removal of: A) flowers past their prime B) dead, broken, or diseased branches on a tree C) roots in a potted plant overgrowing their pot D) branches on a shrub that are crossing and chafing E) A, B, C, and D F) just B and D If you guessed E, Congratulations, you re smarter than a 5 th grader! What is Pruning? Selective removal or reduction of certain plant parts that are not required, are no longer effective, or are of no use to the plant in order to improve the health, value, or beauty of the plant. Although shoots and branches are the main targets for removal, roots, flower buds, fruits and seed pods may also be pruned. Who Can Prune? Anyone you trust with scissors and sharp objects can prune trees and shrubs Even small children can help prune (AKA deadhead) gone-by flowers in the garden If you have ever mowed your lawn, you have already pruned the grass! photo courtesy of Andrea Burke 2
3 Is Pruning Necessary? Some species require pruning no matter where they are for optimum flowering, growth, or fruiting. Choosing the proper plant for a location will minimize the amount of pruning needed. Always read the tag before you buy the plant at a nursery. Image from Purdue Cooperative Extension, Pruning: Why Bother? The Many Reasons Why we Prune Why do we prune? Increase the value and beauty of landscape plants Influence fruiting and flowering Image courtesy of Andrea Burke 3
4 Why do we prune? Restrict growth or size of the plant Before After Images courtesy of Andrea Burke Why do we prune? To train the plant to grow a certain way Images courtesy of Matthew Trump and Dake, commons.wikimedia.org Why do we prune? Helps maintain plant health Can limit spread of disease Removes dead, diseased, or broken branches Pruning a dense canopy lets in more air and sunlight Pruning old trees or shrubs helps rejuvenate them Prevent personal injury or property damage 4
5 Tools of the Trade Scissors, Saws, and Power Tools Tools of the Trade Hand pruning shears For stems up to ¾ inches in diameter Bypass pruners Scissor type blades that overlap More expensive, but make cleaner, closer cuts Anvil pruners Straight upper blades that cut against flat lower plates Usually cheaper, but tend to crush stems as they cut Images from Virginia Tech Cooperative Extension Tools of the Trade Lopping shears Have long handles to give you extra reach and better leverage High quality loppers can cut through about 2 or more inches, depending on the hardness of the wood (oak vs. ash) and condition (live or rotting) Ratchet joints and gears assist best in heavy duty jobs Image from University of Minnesota Cooperative Extension 5
6 Tools of the Trade Pruning saws Useful for cutting larger branches (over 1 inch diameter) Fine toothed, curved saws are good for branches up to 2 diameter Coarse toothed saws are better for branches 3 or more in diameter Images from Texas A&M Cooperative Extension Tools of the Trade Hedge shears For shearing plants into hedges Can be manual or power Cut small, succulent stems best Images from Texas A&M Cooperative Extension Tools of the Trade Pole pruners Cutter with one hooked blade above and a cutting blade beneath, like lopping shears Cutter is on a pole and operated by pulling a rope downward Cut out of reach branches up to 2 in diameter Image from Texas A&M Cooperative Extension 6
7 Tools of the Trade Chain saws Come in a variety of sizes and strengths May be gas or electric powered For removing branches greater than 3 diameter Best for removing trees and cutting firewood Always follow safety precautions when using a chainsaw. The limb you save may be your own. Caring for your Tools Clean and oil tools regularly, including oiling blades and other metal surfaces When pruning diseased plants, disinfect shears and blades between cuts with a solution of one part bleach to nine parts water. Oil well at the end of the day to avoid rust. Store in a dry room Keep cutting edges sharp Paint, varnish, or treat wooden handles regularly with linseed oil Always use tools properly and follow manufacturer s directions How To Prune Making Cuts Correctly 7
8 Before You Cut: Have A Pruning Plan Prune first for SAFETY, next for HEALTH, and finally for AESTHETICS Step 1: SAFETY: Dead, broken, or problem limbs Step 2: HEALTH: Disease or insect-infested wood Step 3: AESTHETICS: Make the tree grow in the desired shape or fill in gaps General Guidelines for Making Cuts All pruning cuts should be clean and smooth for best healing Make sure your tools are sharp! Do not leave stubs Avoid tearing bark Remember animals wounds heal, plant wounds seal Wound dressing is unnecessary Sometimes useful to prevent the spread of diseases (oak wilt and Dutch elm disease) Making Cuts Properly Remove as much branch as possible without damaging the trunk or stem. Cut beginning just outside the branch bark ridge, angling down away from the stem of the tree, avoiding the branch collar Image from USDA Forest Service 8
9 Making Cuts Properly Branches big enough to require a saw should be supported with one hand during cutting If the branch is too heavy to support, make a three-step cut to prevent ripping (see diagram) Image from USDA Forest Service Pruning Begins at Planting! Pruning a tree while it is young is preventative maintenance! At planting remove dead, diseased, or broken branches The first winter begin to train the tree Pruning Begins at Planting! Pruning young shrubs is not as critical as young trees Good pruning practices encourage the best branching structure For bare root shrubs, thin branches for good spacing Prune broken, diseased, or crossing/circular roots Newly planted shrubs require little pruning if they were container-grown or dug with a soil ball 9
10 Pruning a Larger Tree Most pruning of large trees requires specialized equipment and should be left to qualified, insured professionals Consider the natural form of the tree whenever possible Three main ways to prune a large tree: Crown thinning Crown raising Crown reduction least desirable Crown Thinning Selectively remove branches throughout the crown, focusing on weak branches Develops or maintains a tree s structure and form Promotes better form and health by increasing light penetration and air movement Never remove more than ¼ of the living crown Image from USDA Forest Service Crown Raising Remove lower branches to allow more clearance above lawns, sidewalks, streets, etc. On younger trees, maintain temporary branches to encourage taper and protect trees from vandals and sun scald Image from USDA Forest Service 10
11 Crown Reduction Remove large branches at the top to reduce tree height Different from topping, because no stubs are left A last resort, as large pruning wounds may lead to decay Better long term solution is to plant a shorter tree Image from USDA Forest Service Pruning a Larger Tree Repairing Injury Remember: Plant wounds don t heal, they seal Injury to bark Cut away damaged bark Shape the edge of the wound to an elongated ellipse if possible Remove splintered wood and smooth exposed area with a chisel Pruning a Larger Tree Repairing Injury Cavities or hollows in the main trunk Create weep holes if water is not draining Keep the cavity clean of debris and leaves It is not necessary to fill the cavity with anything Storm damage or lightning strike Remove broken branches and reshape the tree as much as possible Remove branches shattered or damaged by lightning Split crotches or cracked limbs may be mended by professional arborists 11
12 Pruning Shrubs 3 main ways: Thinning Gradual Renewal Rejuvenation Pruning Shrubs - Thinning The goal of thinning a shrub is to open the plant and allow in more sunlight and airflow Thinning does not stimulate excess new growth, but does open room for side branches to grow Cut off branch or twig to its point of origin on the parent branch, to a side branch, or at ground level Cut the oldest and tallest stems first (this allows for side branch development) Pruning Shrubs Gradual Renewal Gradual renewal removes all top-growth over 3 years, encouraging new stems to grow from the roots The first year, remove 1/3 of the oldest, thickest branches at or just above ground level The second year, remove 1/2 of the remaining old stems and tip back long shoots growing from the previous pruning cuts The third year, remove remaining old wood and tip back the new shoots 12
13 Pruning Shrubs - Rejuvenation Rejuvenation involves severely cutting all the branches of a shrub to a set height, usually 6-12 above ground, before new growth begins in the spring Rejuvenate every 3-5 years, or when the shrub begins to look excessively leggy Pruning Shrubs - Rejuvenation Some examples of plants that tolerate rejuvenation: Rose of sharon, forsythia, privet, honeysuckle, elderberry, spiraea, potentilla, red-twig dogwood, lilac, and most Hydrangea Examples of plants that do NOT tolerate rejuvenation: Boxwood, juniper, pine, cypress, cedar, arborvitae, yew, and other narrow leaf evergreens Shrubs with excessive amounts of dead branches (more than 1/3) Pruning Shrubs Image from Texas A&M Cooperative Extension 13
14 Pruning Hedges Prune hedges often, approximately after every 6 to 8 inches of growth, to within 2 inches of the last pruning Prune up to twice a year, in the spring and again in midsummer Ideally, the hedge should be wider at the base than at the top, to allow equal access to sunlight and prevent legginess Images from Texas A&M Cooperative Extension Pruning Hedges Can Be Fun! Image Courtesy of Stephanie Weber Pruning Roses Hybrid Teas, Floribundas, and Grandifloras To encourage large blooms suitable for cutting, cut back all but 3 to 5 of the healthiest, most vigorous canes in early spring just as buds begin to swell Prune these 3-5 canes to from the ground Prune away weak, small, or short stems (anything thinner than a pencil should be cut) Image Courtesy of Stephanie Weber 14
15 Pruning Roses Climbing roses, Old-fashioned rambling roses These bloom on last year s growth, so do not prune until after flowering Remove oldest stems, leaving 5 7 strong canes untouched. Remember, the stems you leave will bear next year s flowers. Old Garden Roses Hard pruning can ruin their graceful shape Remove no more than 1/3 of each bush Generally remove old stems that are no longer productive Pruning Evergreens Most evergreens seldom require pruning Prune a little each year so that severe pruning is not needed It s better to buy a dwarf plant than do a lot of pruning on many evergreens When pruning narrow leaved evergreens, never cut into the bare wood beyond the foliage Many evergreens do not have buds on older twigs, and the shrub may never recover Only cut the central trunk if you are trying to eliminate a multiple leader (such as when the tree is young) Pruning Evergreens Spruces, Firs, and Douglas Firs Have lateral buds that will grow if the terminal bud is removed Pines Removing terminal buds will take away growing points for that branch, leading to dead stubs To promote more dense growth you may remove up to 2/3 of the new growth Do NOT prune past current year s growth! Arborvitae, Junipers, Yews, and Hemlocks Tolerate heavy shearing Natural form is usually the most attractive 15
16 Activity What to Cut This Young Tree Needs Some Help There are six cuts that need to be made on this tree. Determine which branches should be cut, and why! Image adapted from University of Minnesota Cooperative Extension This Young Tree Needs Some Help Image from University of Minnesota Cooperative Extension 16
17 When to Prune Yes, It Matters!! When to Prune Rules of Thumb Pruning at the wrong time of the year usually doesn t kill your plant, but can damage it Continually pruning your plant at the wrong time CAN cause permanent damage and/or death to the plant In general, the best time to prune is in late winter to early spring, before the season s growth begins Generally, the worst time to prune is immediately after new growth begins in the spring The second worst time to prune is in late summer Dead branches can be pruned at any time General Guidelines for Timing Prune before breakfast, not before bed Generally prune in the spring, not fall Hair cuts after the prom, not before Prune spring plants right after bloom, not before Diet before Vacation, not after Prune summer plants before they bloom, not after When you move, it is a good time to clear out the junk Root prune and top prune plants if they need it when you transplant them 17
18 Spring Flowering Shrubs Image courtesy of Stephanie Weber Spring Flowering Shrubs Bloom in the spring on previous season s growth Examples include lilac, forsythia, and rhododendron Pruning time will vary based on condition of the plant Shrubs only requiring light pruning Prune immediately after bloom Old, neglected, severely overgrown shrubs May require extensive pruning Rejuvenate by pruning in late winter or early spring (March to early April) This will reduce or eliminate this and possibly next year s flower display, but greatly increase the long-term health of the shrub Summer Flowering Shrubs Bloom in the summer on current year s growth Examples include potentilla, Rose of Sharon, hydrangea, and spirea Prune in late winter or early spring This will allow for bloom in the coming summer Image courtesy of Stephanie Weber 18
19 Other Deciduous Shrubs Many deciduous shrubs don t produce showy flowers, but may have striking bark, fruit, or fall leaf color Prune these in late winter or early spring before growth begins Do NOT prune these in late summer or early fall (any time after mid-july) Roses Repeat blooming roses (floribunda, hybrid teas) Prune heavily in the spring, just as the buds begin to break dormancy (begin to swell) Roses that bloom once a year (old-fashioned roses and climbers) Prune immediately after flowering Do NOT prune heavily in early spring, since they bloom on wood from the previous year s growth Evergreen Shrubs Examples of evergreen shrubs include juniper, yew, and arborvitae Prune in late March to mid- April before new growth begins Some light pruning may be done in late June or early July Image courtesy of Chris Evans, River to River CWMA, Bugwood.org 19
20 Deciduous Trees Examples of deciduous trees include oak, maple, and birch Deciduous trees may be pruned anytime during the year The BEST time to prune is late winter to early spring, before the leaves are out on the trees Some trees with high sap pressure (such as maple) will bleed heavily when pruned at this time, but this is not harmful to the tree Image courtesy of Joseph O'Brien, USDA Forest Service, Bugwood.org Deciduous Trees Avoid pruning oaks from April 15 to July 1 because of the risk of oak wilt fungus. Oaks can be safely pruned in February and March. Image courtesy of Chris Evans, River to River CWMA, Bugwood.org Fruit Trees Prune from late February to early April Spring and summer pruning increases infection and the spread of fireblight Plants susceptible to fireblight, such as apple and pear, should ONLY be pruned during the dormant season Fruit trees pruned in the fall may be more prone to winter injury Image courtesy of Joseph LaForest, University of Georgia, Bugwood.org 20
21 Grape Vines and Raspberries Prune grape vines in March or early April A hard frost in late winter can damage the canes and buds if vines are pruned too early Vines will bleed heavily when pruned at this time, but the bleeding will not harm the vine Prune raspberries in March or early April Summer bearing raspberries should also be pruned in the summer. Remove old fruiting canes after the crop has been harvested. Annual Pruning At a Glance Late winter (before the leaves are out) Deciduous trees (never prune oaks April 1 July 1) Fruit trees (late Feb to early April) Late winter/early Spring (March to early April) Summer-flowering shrubs Hard pruning of severely overgrown spring-flowering shrubs Other deciduous (non-blooming) shrubs Grape vines and raspberries Evergreen shrubs Late spring (May and June) Spring-flowering shrubs (when they re done with their bloom) Exceptions to the Rules Prune at any time to correct damage to limbs, vandalism, or hazards created by weather or other causes Formal hedges and specialty pruning like espalier and bonsai require more frequent maintenance than informal hedges, or plants maintained in their natural form Exact timing of pruning will vary across climate zones. Follow cues from the plant to determine ideal time of pruning. 21
22 Love Hurts What NOT To Do Topping and Tipping Topping is the pruning of large upright branches between nodes, sometimes done to reduce the height of the tree Tipping is cutting lateral branches between nodes to reduce crown width Consequences: Death of the cut branch back to the next lateral branch below Epicormic sprouts, which are only weakly attached to the steam and eventually will be supported only by a decaying branch. Images from USDA Forest Service Topping, AKA Tree Abuse Images courtesy of Joseph O'Brien, USDA Forest Service, Bugwood.org 22
23 Improper Cuts Improper pruning cuts cause unnecessary injury and bark ripping (AKA, the Nearly Headless Nick cut) Flush cuts injure stem tissues and can result in decay Stub cuts delay wound closure and can allow pathogens to enter the plant Images from USDA Forest Service How to Tell The quality of a cut is evident after one growing season A concentric ring of wound wood will form around a proper pruning cut Flush cuts (cutting too close) will show excess wound wood on the sides with very little on the top or bottom Stub cuts (cutting too far) result in dead branch tissue. Wound wood forms from stem/trunk tissue, so wound closing is delayed. Bark Ripping Images courtesy of Joseph O'Brien, USDA Forest Service, Bugwood.org 23
24 Flush Cutting Images courtesy of Joseph O'Brien, USDA Forest Service, Bugwood.org Stubs The longer the stub, the more food you ve set out for wood-decaying fungi If you can hang your hat on it, it s too long! Joseph LaForest, University of Georgia, Bugwood.org Joseph O'Brien, USDA Forest Service, Bugwood.org Pruning Safety: Use Common Sense! Images courtesy of Purdue Cooperative Extension, 24
25 Pruning Safety: Use Common Sense! Images courtesy of Purdue Cooperative Extension, Activity Break up into groups and look at your handouts showing pictures of various pruning cuts. Was the tree in your picture properly pruned or not? If not, what was done wrong? 25
26 Image courtesy of Joseph O'Brien, USDA Forest Service, Bugwood.org Image courtesy of Joseph O'Brien, USDA Forest Service, Bugwood.org Image courtesy of Joseph O'Brien, USDA Forest Service, Bugwood.org 26
27 Image courtesy of Fred Baker, Utah State University, Bugwood.org Image courtesy of Joseph O'Brien, USDA Forest Service, Bugwood.org Image courtesy of Joseph O'Brien, USDA Forest Service, Bugwood.org 27
28 Image courtesy of Joseph O'Brien, USDA Forest Service, Bugwood.org Image courtesy of Joseph O'Brien, USDA Forest Service, Bugwood.org Image courtesy of Joseph O'Brien, USDA Forest Service, Bugwood.org 28
29 Image courtesy of Joseph O'Brien, USDA Forest Service, Bugwood.org Image courtesy of A. Steven Munson, USDA Forest Service, Bugwood.org Image courtesy of Joseph LaForest, University of Georgia, Bugwood.org 29
30 Image courtesy of Joseph O'Brien, USDA Forest Service, Bugwood.org Image courtesy of Joseph O'Brien, USDA Forest Service, Bugwood.org Image courtesy of Joseph O'Brien, USDA Forest Service, Bugwood.org 30
31 Image courtesy of USDA Forest Service - Northeastern Area Archive, USDA Forest Service, Bugwood.org Pruning Resources Resources The Internet You can find a wealth of information by searching Google.com Only trust reputable sites Universities and Cooperative Extension offices are best USDA and other government sites Take what you read on store and company websites with a grain of salt Remember, just because they re selling something doesn t mean you need it 31
32 Some Useful Web Pages Colorado State University Extension Pruning Flowering Shrubs North Carolina State University Extension Pruning Shrubs Pennsylvania State University Pruning Ornamental Plants Texas A&M Extension Follow Proper Pruning Techniques University of Minnesota Extension Pruning Trees and Shrubs USDA Forestry Service How to Prune Trees Virginia Cooperative Extension A Guide to Successful Pruning: Pruning Basics and Tools There are others!!! Other Resources Extension Agents, Professors, Other Specialists Libraries and Bookstores Any Questions? 32
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