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AGEH 28, Fall 2013 Shasta College Arboretum

AGEH 28, Fall 2013 Shasta College Arboretum. Fraxinus latifolia , Oregon ash olive family, Oleaceae. Fraxinus latifolia , Oregon ash olive family, Oleaceae. Deciduous tree to 40-80 x 30-50 ft; native to Sierra Nevada, and N. Calif to BC

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AGEH 28, Fall 2013 Shasta College Arboretum

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  1. AGEH 28, Fall 2013Shasta College Arboretum

  2. Fraxinuslatifolia, Oregon ash olive family, Oleaceae

  3. Fraxinuslatifolia, Oregon ash olive family, Oleaceae • Deciduous tree to 40-80 x 30-50 ft; native to Sierra Nevada, and N. Calif to BC • ID: Lvs 6-12 ”, 5-7 leaflets, end leaflet larger than side ones; tree dioecious (sexes on separate plants); fruit a flat samara with a terminal wing, hanging in clusters • Care: Sun, no irrigation when established; tolerates standing water in winter • Value: fall color!! • Problems: leaf spot fungi even on healthy plants, heart rot on older trees, various insects

  4. Nyssa sylvatica, sourgum, tupelo; Nyssa family, Nyssaceae

  5. Nyssa sylvatica, Sourgum, tupelo

  6. Nyssa sylvatica, Sourgum, tupelo, Nyssa family (Nyssaceae) Native to eastern US; 30-50 x 15-25 ft Likes moist deep soil, will tolerate some drought, takes poorly drained, heavy soils Excellent shade tree; fruit sour, but attractive to birds; good fall color even in mild winter climates Fruit a drupe (like olive)

  7. Albiziajulibrissin, silk tree, “mimosa”Pea family, Fabaceae

  8. Albizia (Albizzia) julibrissin, silk tree, “mimosa” • Native to Asia • ID: Tree to 40 ft, twice as wide as highLeaves 2x pinnate, Flowers powder-puff, ‘Rosea’ has richer pink • Value: Likes high summer heat; tolerates low water; makes shade; flowers fragrant, attract bees and hummingbirds • Problems: somewhat invasive in moist places; a bit messy,

  9. Euonymus alatus, winged burning bush

  10. Euonymus alatus, winged burning bush FALL COLOR!!

  11. Euonymus alatus, winged burning bush • Native to northern Asia; needs moderate water • ID: leaves opposite, oval, 2 in., twigs usually with corky wings • Tolerates full shade, but best color in sun or part shade • Species plants can be large (20 ft); buy compact forms ‘Compacta’, etc.; good against dark evergreens (brick walls???)

  12. Invasive in wildlands where there is summer rain (by seeds)

  13. Hibiscus syriacus, rose of sharon

  14. Hibiscus syriacus, rose of sharon • Deciduous shrub from E. Asia • 10-12 x 6-12 ft.; can be trained as small tree, espalier • Likes heat, needs sun and moderate water to bloom well

  15. Hibiscus syriacus, rose of sharon • Can seed around; buy good forms (sterile triploids: Aphrodite, Diana, Helene, Minerva); • For larger flowers, cut back last season’s growth to 2 buds

  16. Populus nigra ‘Italica’, Lombardy poplar

  17. Populus nigra ‘Italica’, Lombardy poplar • Native to Europe; grows 50-100 x 10-30 ft. • ID: tall and narrow; leaf slightly diamond-shaped at base, narrowed to long tip, serrate • Value: Fast and tough; good for hot summer/cold winter climates; yellow fall color; dramatic in the landscape; wooden shoes • Problems: suckers profusely, heaves, clogs sewer pipes

  18. Populus nigra ‘Italica’, Lombardy poplar • Forms: ‘Italica’ is a male form, no seeds; female poplars produce lots of cottony fruit

  19. Syringa vulgaris, common lilac ID: shrub, to 20 x 20 ft; leaf heart-shaped (cordate); fragrant flowers

  20. Syringa vulgaris, common lilac • Native to E. Europe • Needs: sun/ part shade; some water; winter chill, neutral to alkaline soil (add lime if needed) • Care: Must prune just after flowering (you have a week, maybe); also, prune out a few of the oldest stems each year to encourage new growth • Forms: Zillions (hundreds) of varieties

  21. Salix babylonica, weeping willow

  22. Salix babylonica, weeping willow Tolerates poor drainage Large tree (50 ft high and wide), rather short-lived, with weak wood; not suitable for city lots Largely replaced in gardens by S. x sepulcralis ‘Chrysocoma’; there are also other better forms for this same look.

  23. Taxodium distichum Taxodium distichum, swamp cypress

  24. Taxodiumdistichum, swamp cypress

  25. Taxodiumdistichum, swamp cypress Native to southeastern US 100 ft in the wild, but garden trees 50-70 x 20-30 ft. Very tough, tolerant, deciduous conifers of great size, with shaggy bark and graceful sprays of needlelike leaves. Takes waterlogged or dry soils; good for streambank or lake edge.

  26. Metasequoiaglyptostroboides, dawn redwood

  27. Metasequoiaglyptostroboides, dawn redwood Native to China; thought to be extinct for millions of years but found again in 1940s. Deciduous conifer. Fast growth when young, to a pyramid-shaped adult of 90 x 20 ft. Likes moisture, so grows in lawns, but surface roots lift turf eventually. Winter form sometimes gawky. Resists oak root fungus.

  28. Dawn redwood vs. swamp cypress

  29. Dawn redwood vs. swamp cypress

  30. Cornusstolonifera, redtwig dogwood & yellowtwig dogwood C. s. ‘Arctic Fire’ C. s. ‘Flaviramea’

  31. Cornusstolonifera, redtwig dogwood & yellowtwig dogwood Native to n. Cal and north to Alaska ID: multistem shrub 7-9 x 12 ft. Spreads via underground stems and rooting branches Leaves 1.5 – 2.5 in, oval, deep green; flrs small, white, in clusters; fruits white or bluish Value: 4 Fs, esp. red or orange fall color, and red or yellow winter twigs

  32. Cornus stolonifera, redtwig dogwood & yellowtwig dogwood Care: sun to part shade, regular water (streamside plant in the wild); cut back SEVERELY in late dormant season Use: thrives in coldest mountains, even in valleys of S. Cal, useful for streambanks, property boundaries, screen Names: aka red osier dogwood; Cornussericeavery similar

  33. Forsythia x intermedia, forsythia

  34. Forsythia x intermedia, forsythia Origin: China, olive family ID: 4-petal yellow flowers, vase-shaped or arching shrub; leaves oval with pointed tip, serrate; bark with lenticels

  35. Forsythia xintermedia, forsythia Value: yellow flowers in early spring; tough; very cold hardy; can be forced by picking stems in bud Care: sun, moderate water; prune 1/3 of oldest branches to ground each year Forms: get good ones!

  36. Sophora japonica, “popbead tree”J. pagoda tree, Ch. scholar tree

  37. Sophora japonica, “popbead tree”J. pagoda tree, Ch. scholar tree • Native to China, Korea, Japan • 60 ft high, 2/3 as wide • Use for park, shade • Leaves compound, alternate • Flowers pea-flower-shaped, white, bloom in summer (August) • One of the 50 fundamental herbs used in traditional Chinese medicine • (aka Styphnolobiumjaponicum)

  38. Symphoricarpos x chenaultii, coralberry

  39. Symphoricarpos x chenaultii, coralberry Native to North America; this form is a hybrid of S. orbiculatusfrom eastern US. To about 6 ft; best used as a wild thicket for erosion control on steep banks, spreads by root suckers; needs part to full shade in hot climates. Cut stems nice for winter arrangements. There is a one-foot dwarf ‘Hancock’ valued as woodland groundcover.

  40. Alnuscordata, Italian alder

  41. Alnuscordata, Italian alder Native to Italy and Corsica ID: 40 x 25 ft.; growth vertical when young; leaf heart-shaped, 4 in., glossy rich green; flrs = male soft catkins and female woody catkins (“cones”) Value: good near creeks, fast growth, flrs good display before lvs; favored in the SW “More restrained than A. rhombifolia.” White alder is our native tall alder

  42. Liriodendron tulipifera, tulip treemagnolia family--Magnoliaceae

  43. Liriodendron tulipifera, tulip tree • Native to eastern United States • Tallest deciduous tree in the world—200+ ft. in the wild • Yellow fall color, even in S. Calif.

  44. Flowers not showy, as carried high on tree; but beautiful up close. Starts blooming when 12-15 years old Likes deep rich soil, roots shallow so cannot garden under them Susceptible to Ganoderma root/butt rot fungus. Liriodendron tulipifera, tulip tree

  45. Because of its tall, straight trunk and wood that is soft, lightweight, straight-grained, resistant to splitting, and easily worked, Native Americans and early pioneers frequently hollowed out a single log to make a long dugout canoe. Its wood is sold commercially as “yellow poplar,” & used for furniture, musical instruments, interior finishes, shingles, & boats. Liriodendron tulipifera, tulip tree

  46. Liriodendron tulipifera, tulip tree • ID—tall straight growth, 4-lobed leaves like no other. • ‘tulipfera’ means ‘tulip bearing’

  47. Magnolia family (Magnoliaceae) Ancient flowering plant group; some of the earliest fossil flowers found look like magnolias

  48. Magnolia x soulangeana ‘Rustica Rubra’; RR saucer magnolia More pix

  49. Magnolia x soulangeana ‘Rustica Rubra’ Saucer Magnolia 10-25 x 10-15 ft; Value: spectacular bloom in deep pink before leaves; this form with spectacular fruits (pendent, rose pink, with red “seeds”) attractive to birds Hybrid of M. denudata and M. liliiflora

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