Tree Owner’s Manual - City Of Boise

Installation (Planting) - InstructionsStep 10. Backfill withthe same soil.Make sure the trunk is straight. Putthe original soil back in the hole,breaking up large clods, and workingit in with your hands or a shovel.Step 11. Water.Water the root ball and entirebackfilled area.Step 12. Mulch.To Stake orNot to StakeSome trees need to be stakedto remain standing straight intheir new planting site. Stakeonly if the root ball is unstableor the trunk is bending. Usewide nylon, canvas straps,or nylon stockings wrappedaround one side of the trunk.The tree should not be tiedtightly.Put a 2-4 inch layer of mulch over thebackfilled area. Pull mulch away fromthe trunk so that none touches thebark.!If the root ballis unstable,use 1-3 stakesattached LOWon the trunk.Mulch becomes soil.There should never be more than 4inches of mulch over the roots. Toomuch can prevent the roots fromgetting necessary oxygen.BackfillIf the trunk isbending, use 1stake attachedHIGHER (at least6 inches belowthe first set ofbranches).WaterMulchNo!!Less than 4 inchesdeep, never touchingthe trunkRemove stakes after1 year if the treehas become stable.Tree Owner’s Manual11

MAINTENANCE SCHEDULEFollow this maintenance schedule for the life of your tree. Detailed instructionsare on the pages indicated in parentheses. Use regionally adapted or nativeplants to reduce water and other maintenance needs for the life of the tree.Type ofCare thisTimelineFollowmaintenance schedule for the life of your tree. Detailed instructionsindicatedYearsin parentheses.Care are on theAtpagesplanting1 to 3Years 4 to 10After 10 yearsWater (p. 13) 5 gallonsCorrect amount is As neededcritical from springthroughautumn and duringdry wintersMulch (p. 16) 2-4 inches deep, Check and adjustnot against trunk level in springProtect Trunk As needed(p. 14)Check in spring andautumnN/AStake (p. 11)Only if neededN/AClean RootCollar(p. 15)Uncover atplantingCheck in spring and N/Aautumn. Removeafter 1-2 year.Clean root collarevery yearCheck forEncirclingRoots(p. 9, 15)Check beforeplanting (p. 9)N/ACheck every 4-5years(p. 15)Check Health Select a healthy(p. 17, 35)tree (p. 35)Inspect leaves,branches, crown andtrunk every year (p.17)Check Safety(p. 17)N/AInspect in summer,winter, and afterstorms (p. 17)Prune*(p. 7, 18-23)Prune only critical Prune lightly in Year Every 3 yearsbranches or to2 or 3 (p. 18-23)eliminate extraleaders(p. 7)Fruit trees every1-3 years, otherbroad-leavedtrees every 5years, conifersonly as needed*For some tree types, pruning or removal during certain times of the year can increase thelikelihood of disease transmission. See p. 20 for details.N/A—not applicable12www.treeownersmanual.info

MAINTENANCE INSTRUCTIONSWatering*An important factor in tree survival is providing water at the correct frequency.The first 3 years are most critical, but pay attention to watering needs throughoutthe tree’s life. In arid environments most trees will have to be watered throughoutthe growing season and during dry winters for life unless they are native tothat area.How often and how much?Frequency depends on wateruptake by plants, surfaceevaporation, and soil drainage.Soils that drain quickly will requiremore frequent watering than thosethat drain slowly. To determine yoursoil’s drainage rate, see p. 34. Thebest way to know how often andhow much to water is to check thesoil moisture at 6 to 12 inchesbelow the surface. Water when dry.First 3 years after planting: If thesoil is dry, provide about 2 gallonsof water per diameter inch of thetrunk.All other years: Because soil typeand weather conditions influencethe demand for water, irrigationschedules and amounts vary.!Tree roots need oxygen.Soil saturated with waterfor more than 24 hours canprevent roots from gettingoxygen. Therefore, wateringtoo much is as dangerousas watering too little (and isharder to correct).First 3 years after planting:Check every other day infast-draining soils, weeklyin slow-draining soilsWater the root ball andjust beyondAll other years:CheckweeklyWaterwithin thedripline or,for largetrees, atthe baseand at thedriplineWhere? Water the root ball and justbeyond. For large trees, focus watering onthe area within 6 feet of the trunk and atthe drip line.When? Start checking soil moisture andwatering when necessary in early spring,and continue until the soil freezes. Formild climates, water as needed duringdry winters. For winter watering, choosewarm days above freezing to ensure watersoaks into the ground.*Gilman, E. 1997. Trees for urban and suburban landscapes. Albany, NY: Delmar Publishers. 662 p.Tree Owner’s Manual13

Maintenance InstructionsInstalling a Trunk GuardTrunk ProtectionYoung broad-leaved trees have thin bark that can easily be damaged bysunscald, animals and equipment (most commonly string trimmers and lawnmowers). Mulch does a great job of keeping grass (and therefore grass-cuttingequipment) away from trunks, but rodents such as rabbits and mice like to chewon young bark (usually low on the trunk). Deer also scrape tree trunks with theirantlers.To prevent long-term damage associated with trunk wounding, install plastictubing (to prevent sunscald) or hardware cloth (stiff wire fencing with 1/4-1/2 inchmesh squares) around the trunk. The tube should be big enough around to allow1-4 inches of space between it and the trunk. It should be 1-3 feet tall (extendingabove the anticipated snow depth) for small rodents and as tall as possible fordeer.How? Wrap the tube around the trunk, taking care not to scratch the bark. Usea few pieces of wire to keep the tube closed. Push the tube into the ground ormulch less than an inch. Attach it to one or two stakes if necessary.When? At a minimum, the trunk should be protected during the winter months(apply early in the autumn to prevent deer scraping). Protection can be appliedanytime and left on all year round, as long as it does not touch the bark.!14Your tree will grow.As the tree grows, the tube will need to be enlarged and eventually removed.www.treeownersmanual.info

Maintenance InstructionsPreventing and Correcting Encircling Roots*ProblemHow to PreventRoots that encircle the trunkwill likely cause health or safetyproblems later. Make sure that soilor mulch is never piled against theroot collar.Plant at correct depth (see PlantingSteps 4-7, p. 8-10). Annually cleanthe root collar by removing soil andmulch. CheckyearlyRoot likely to become a problem(when trunk and root meet)How to Monitor andCorrectEvery 3-4 years, check for roots thatencircle the trunk. Use a hand trowelto loosen and remove the soil aroundthe base of the tree until the first set ofroots is found.Expose the root collarProblem root already touching the trunkTIP: Removing soil with a wet-dryvacuum speeds the work withoutharming the roots.Covering the root collar with soil ormulch encourages encircling rootsIf a tree has an encircling root,leave the top of the root exposed,and consult an arborist regardingtreatment. When caught early, thiscan be an inexpensive and effectiveway to save your tree.*Johnson, G.; Fallon, D. 2007. Stem girdling roots: the underground epidemic killing our trees. St. Paul,MN: University of Minnesota.Tree Owner’s Manual15

Maintenance InstructionsMulchingMaintain a ring of organic mulch around the tree (the wider the better). Organicmaterials like wood chips and leaves are best. Wood chips will take longer tobreak down and, therefore, will not require replacement as often. In arid regions,do not use rock or gravel as mulch unless the trees are adapted to dry, rockyenvironments.notagainstbark, 4 inches deepNo!CheckyearlyTIP: Newspaper kills grass.If there is grass in the area that needs to be mulched, put a 5-page layer ofnewspaper over the grass, and then add mulch on top (this will help keep thegrass from growing up through the mulch).!Mulch becomes soil.There should never be more than 4 inches of mulch over the roots. Too muchmulch or soil can prevent oxygen from reaching the roots.FertilizingApply nitrogen fertilizer ONLY if diagnosis by an arborist indicates that it isnecessary.Apply other fertilizers ONLY if a soil test shows that nutrients are lacking.!Do not overdose.Fertilizer that is not absorbed by the tree has the potential to alter the soil or leachout and pollute groundwater, rivers, ponds, and lakes. Overdosing with fertilizercan harm your tree.!Applying “weed and feed” to your lawn might injure or kill your tree.Most combination weed killers and lawn fertilizers will injure trees. Do not useanything that states it will kill broad-leaved weeds (it can harm broad-leaved treesas well). Preemergent herbicides are safe to use near most trees, but alwayscheck the label.In some cases, a long-term plan to change the soil pH may be necessary.16www.treeownersmanual.info

Maintenance InstructionsChecking Tree HealthTree health can be difficult to determine, but checking your tree yearly may helpyou notice problems as they appear.Is the current year’s growth much less than past years’ growth? Fast growthdoes not mean good health, but a dramatic reduction in growth rate may be anindication of poor health.TIP: Look at the branch tips or tree top. Current year’s branches will typicallybe smaller in diameter and a different color.Also inspect the size, color, and distribution of the leaves. Look at individualleaves as well as the whole crown for differences between branches or sectionsof the crown.Inspect the base of the trunk for damage (e.g., from rodentsor string trimmers).Also inspect the base of the tree to see if there is a flat sideto the trunk.If anything is found, follow the guidance in the Troubleshooting section, p. 30-31.Checking Tree Safety!Healthy trees can fall down.A tree may be green and lush, but that does not guarantee that it is structurally safe.Inspect trees anytime, but especially after storms. Examine the crown, branches,trunk, and area around the roots for these common dangers: Broken, dead, or hanging branchesCracks, fungi, and cavitiesWeak trunk or branch unionsEncircling root compressing thetrunk (a flat-sided trunk at theground level is a good indicator).See illustration above. Recent lean (especially if the soil orgrass has lifted on one side).Branch UnionsWeak—barkgrown inStrong—barkpushed outIf anything is found, or if in doubt, contact an arborist, p. 28.Tree Owner’s Manual17

Maintenance InstructionsPruning*Pruning can be dangerous work. Follow these safety precautions to be sure youare around to enjoy your tree.Electricity flows through branches.Never prune trees or branches that are within 10 feet of utility lines; instead contactyour local utility company.Ladders and trees do not mix.If pruning cannot be done with both feet on the ground, hire an arborist (p. 28).Chainsaws cut limbs.If power equipment is required, hire an arborist (p. 28).The main reasons for pruning trees are safety, health, and esthetics. Pruningcan encourage trees to develop a strong structure and reduce the likelihood ofdamage during severe weather.Pruning for safety involves removing branches that could fall and cause injury orproperty damage, trimming branches that interfere with lines of sight on streets ordriveways, and removing branches that grow into utility lines.Pruning for health involves removing diseased or insect-infested wood andrubbing branches and properly thinning the crown to increase airflow and reducesome pest problems. Keep in mind that pruning is recommended for improvingthe structure of a tree and is not generally a good pest-control practice. Overpruning can produce problems of its own.Pruning for esthetics involves enhancing the natural form and character of treesor stimulating flower production.*Except where noted, this section has been adapted in part, from: Bedker, P.; O’Brien, J.; Mielke, M.1995. How to prune trees. [Newtown Square], PA: USDA Forest Service Northeastern Area. 30 p.18www.treeownersmanual.info

Maintenance Instructions - PruningWhere to CutSupport the branch with one hand while you make the cut to prevent the barkfrom ripping. If the branch is too large to support, use the three-step method (seedetails below).For the final cut, look for the branch bark ridge and trunk collar. Begin the cut justoutside of the branch bark ridge, and angle down away from the trunk. Stay closeto the trunk collar without cutting into it (see images below).branchbark ridgeThree-step method trunk collar1. Cut one-third of the waythrough the branch on theunder side.2. Go 2-4 inches beyond theundercut to remove thebranch.3. Make the final cut justoutside the branch barkridge and trunk collar.smallbranchlargerbranch finalcutPruning ToolsHand pruner—bypass typeBESTLopper—bypass typeBypass blades cross each otherlike those in a scissors.Hand sawPole saw or prunerPruning saws usually havecurved blades with teeth thatcut when you pull.OKBow saws can be used, but it is often difficult to fit thesaw between branches to make the correct pruning cut.Tree Owner’s Manual19

Maintenance Instructions - PruningHow OftenBeginning 2 years after planting, prune broad-leaved trees lightly every year(only if needed) or every other year. After 10 years, frequency of pruningdepends on the type of tree and amount of shade the canopy receives.!Do not remove more than 25 percent of the tree’s live branches (and thereforeleaves) at any one time.First 10years10 YearsAfter PlantingFruit treesOnce every 1-2 yearsOnce every 1-3 yearsBroad-leaved treesOnce every 1-2 yearsOnce every 4-7 years*Only as needed**Only as needed**Tree TypeConifer treesPalmsOnce every 3-6 months in tropical climates, annuallyotherwise**** Pruning lightly and more frequently is better than pruning heavily and less often.** Conifer trees usually need pruning only if they are diseased or their branches need tobe raised up from the ground. In either case, prune off the entire branch (p. 19).*** Prune only dead or dying fronds. If fruit is a problem, remove flower stalks or fruitclusters as needed.Removal of the following can be done every year: Broken, dead, or rubbing branches Competing leaders Branches sprouting from the base of the trunk.Time of YearWinter is the best time of year to prune because branches are easy to see,diseases cannot be spread, and there is minimal stress to the tree. But for mosttrees, pruning can be done at any time. Exceptions are trees that are prone tofire blight or oak wilt or within the adult life cycle of harmful insects such as elmbark beetle or emerald ash borer.Trees susceptible to fire blight include mountain ash, apple, crabapple, hawthorn,pear, flowering quince, and pyracantha. Trees susceptible to oak wilt includemost oaks (has not been found in Boise). To minimize disease infection ofthese types of trees, follow the pruning guidelines on the next page.20www.treeownersmanual.info

Maintenance Instructions - PruningFIRE BLIGHTRange:Types of trees:All counties in the United Statesmountain-ash, apple, crabapple, hawthorn, pear,flowering quince, pyracanthaPruning guidelines: Avoid pruning from the time that spring flowers emergeuntil leaves drop. If pruning must be done on thesetree types during disease-transmission times, sanitizepruning tools before each branch is pruned. Userubbing alcohol, or household bleach diluted 1 to 9with water. Tools should be immersed in the solution,preferably for 1-2 minutes. Bleach is corrosive tometal, so tools should be thoroughly cleaned with soapand water after each use.OAK WILTRange:See map belowTypes of trees:oaksPruning guidelines: Avoid pruning from early spring through early summer(April, May, and June in the Lakes States). Check withyour plant diagnostic clinic (see page 31 for phonenumbers) to get exact dates for your area. If pruningmust be done on oaks during disease-transmissiontimes, immediately apply wound paint after the cut ismade.!Wound dressings are not necessary in any other case. In fact, they may beharmful.Tree Owner’s Manual21

Maintenance Instructions - PruningPruning Young Trees*Pruning a young tree saves money. Removing small branches is fairly easycompared with waiting until limbs are large, when pruning can be costly anda bigger risk to the tree. Correctly pruning a tree when it’s young will help itdevelop a strong, well-balanced crown. Prune to have the following:A. Branches that are well-attached to the trunkBranches with a branch bark ridge (bark pushed out at the point where thebranch attaches to the trunk) are less likely to break off in wind or heavy ice orsnow. Branches that are less than half the diameter of the trunk are also lesslikely to break off in storms.B. One central leaderMost trees will be strongest if they have one central leader (instead ofmultiple). Unless your tree is an arborvitae or fruit tree, choose one leader tokeep, and prune off the competitors.C. Good spaci

If your tree will grow taller than 30 feet, do not plant it within 25 feet of overhead electric wires. Trees over 30 feet 25 feet from wires 30 or more feet between larger maturing trees 15 feet from buildings 3 feet from pavement! Tree O