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Pruning Shrubs part2

Pruning Shrubs part2






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    Pruning Shrubs part2 Pruning Shrubs part2 Presentation Transcript

    • Pruning permanent frameworkGenerally assume regular shape Ceanothus „Julia Phelps‟ Pieris „White Cascade‟
    • Many of these plants form a dome-shaped canopy
    •  Remove: • dead • damagedCistus „Silver Pink‟
    • LavenderLavandula spp.
    • Removal of errant shoots help shape
    • “Cubist” pruning is common…
    • Or, the meatball variation…
    • Think about flowering time before pruning!
    • Pittosporum tenuifolium„Silver Sheen‟
    • Shearing removes form, but hopefully not flowers… Arbutus unedo (Strawberry tree)
    • Pruning subshrubs  have woody base, but bloom on current season‟s shoots  some become larger and more woody in mild climates  avoid pruning until after risk of severe freeze Buddleia nivea
    • Small subshrubs which may be sheared: Epilobium canum Penstemon pinifolius
    • Remove most shoot growth to baseAugust 2010 January 2011
    • Before… After…
    • Larger subshrubs… Caryopteris x clandonensis Perovskia atriplicifolia
    • Spiraea
    • Large subshrubs Buddleia „Pink Delight‟ Heptacodium miconioides
    •  Remove dead stems, prune hard in springLavatera: early spring 10 minutes work!
    • Note where cuts made… Look how much growth is removed!
    • Later…
    • Heptacodium miconioides
    • Suckering shrubsNaturally thicket-forming plants  Includes: • Aralia spp. • Clerodendrum spp. • Kerria japonica • Rhus spp. • Rubus spp. • Symphoricarpos spp. • Syringa vulgaris • Zenobia pulverulenta  Dig suckersRhus typhina „Laciniata‟  Use barriers
    • Pruning ConifersFor pruning purposes, there are two types:Needle-like leaves Scale-like foliageWhorled branches Random branches
    • Needle-foliage Conifers: Pine Family Abies: The Firs Cedrus: True Cedars Picea: The Spruces Pinus: The Pines Pseudotsuga: Douglasfir Tsuga: The Hemlocks
    • When sited correctly, rarely need pruning Abies pinsapo „Glauca‟ Pinus thunbergii „Thunderhead‟
    • The biggest mistake: pruning into un-needled growth
    • Pine FamilyTo dwarf plant and fill incanopy, pinch back newgrowth at “candle” stageDo not cut into old, un-needled parts of stem!
    • Candles on pines are easily broken at this stage
    • Candle pruning makes a conifer…  dwarfer  bushier
    • Some conifers revert as well… Alberta spruce
    • Scale-foliage Conifers: Cypress Family Calocedrus  Incense Cedar Chamecyparis  Hinoki Cypress Cupressus  Monterey, Italian Cypress X Cupressocyparis leylandii  Leyland Cypress Juniperus  many, many species/forms Thuja  Arborvitae, Western Redcedar
    • Cypress family plants respond well tolight trimming and make good hedges Don‟t prune into older un-needled parts of plant!
    • Effects of hard pruning: Cutting back hedge Limbing up too-big shrub
    • Conifers that respond to cutting to older wood:Taxus: Yews Sequoia: Redwood Cryptomeria: Japanese cedar
    • Pruning Vines
    • Pruning need depends on vigor, climbing habit… Wisteria Jasminum x stephanense rampant growing  many thin canes permanent framework  cane-grower
    • Consider the climbing habit of the plant: Non-clinging plants: Roses
    • Twining growth habit:Clematis JasminumHumulus TrachelospermumLonicera Wisteria Tendrils: Ampelopsis Passiflora Vitis
    • Clinging vines Campsis (aerial rootlets)  (will also sucker) Hydrangea anomala (aerial rootlets) Hedera (aerial rootlets) Parthenocissus (tendrils) Schizophragma (aerial rootlets) Little or no pruning required
    • The support structure and vine must match!
    • Climbing roses
    • A trellis can be very simple…
    • Old trees make a goodmakeshift trellis, too
    • Climbers-modern: very tall bush roses, repeat renew framework regularly Rambling Roses  annual cane production  train stems flat  remove flowered stems  thin/shorten excess canes
    • Climbing rosesSpreading out stems horizontally encourages branching
    • Climbing Rose: „Westerland‟Modern Climberi.e. blooms on new wood
    • Early spring…
    • Later…
    • Rambling Rose „Dorothy Perkins‟ Once-bloomingJune 2004
    • Sept. 2004 July 2005
    • July 2006
    • For a full arbor youwill need to plant onboth sides
    • Twining vines Clematis armandii
    • As with other vines,match the vine withavailable space
    • Over time, many twining climbers form a “mushroom” Jasminum x stephanense
    • Or, the shape of a TV antenna…
    • Young vines: shoot placement
    • Lonicera japonicaIn bloom, June After pruning
    • Pruning vining ClematisFor pruning purposes, 3 “groups”based on flowering time: Spring: (Group 1) C. armandii, C. montana Repeat bloom: (Group 2) Large-flowered hybrids C. „Nelly Moser‟ Summer-Fall: (Group 3) C. x jackmanii, C. texensis C. paniculata, C. viticella
    • A simple trellis…
    • Pruning Clematis-Group 1 and 2
    • Pruning vines: Clematis Group 2 (and 1)  Remove weak growths Thin stems to well—spaced framework
    • Pruning Clematis-Group 3
    • Pruning Clematis Group 3  Prune low to a pair of strong buds early spring  Remove dead stems
    • Training Wisteria
    • Trees make handy trellises…
    • Brickell and JoyceDK Publishing, 1996ISBN 1-56458-331-7
    • Brown and KirkhamTimber Press, 2004ISBN 0-88192-613-2
    • Cass TurnbullSasquatch BooksISBN 1570613168
    • Other references:PlantAmnestyhttp://www.plantamnesty.org/  Pruning tipsPNW-International Society of Arboriculturehttp://www.pnwisa.org/  Pruning information  Publications  Lists of Consulting Arborists
    • The End!Ceanothus griseus „Kurt Zadnik‟