Hort 28 McConnell Arboretum and Gardens
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Transcript of Hort 28 McConnell Arboretum and Gardens
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Hort 28 McConnell
Arboretum and Gardens
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Perovskia atriplicifolia, Russian sage
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Perovskia atriplicifolia, Russian sage
• Native to w. and central Asia• ID: woody-based clump 4 ft x 4 ft with
many upright stems; lvs gray-green, opposite, aromatic, lower are deeply cut, upper merely toothed; flrs in sprays, make a purple haze
• Value: long-lasting haze of purple bloom (June to frost), heat and drought tolerant, sun tolerant
• Care: trim spent blossoms to extend bloom; little water; can be invasive in some areas
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Solanum laxum, potato vinenightshade family--Solanaceae
Vine for fence, trellisAt edge of its hardiness in Redding—may be killed in cold winterPoisonous foliage (all nightshades) and fruits (some nightshades)
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Solanum laxum, potato vinenightshade family--Solanaceae
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Rosa chinensis ‘Mutabilis’China rose
rose family--Rosaceae
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Rosa chinensis ‘Mutabilis’• 4-ft shrub, may climb if supported• Flowers single, change color, borne all
summer ‘til frost• Good low-care rose for mixed shrub
border
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Rosa ‘Sally Holmes’Roses have alternate, pinnately compound leaves WiTH STIPULESNodal spines, internodal prickles
Single ‘wild-type’ roses have 5 petals, 5 sepals, numerous stamens surrounding a cluster of simple pistils; fruit is a rose hip
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x Chitalpa tashkentensis ‘Pink Dawn’catalpa family--Bignoniaceae
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x Chitalpa tashkentensis ‘Pink Dawn’
• Intergeneric hybrid between Chilopsis (desert willow) and Catalpa; combines drought tolerance with large flowers
• ID: Decidous tree 20-30 x 20-30ft; leaves long and narrow; flowers tubular, in clusters
• Value: drought tolerant, flowers, shade• Problems: messy• Care: Do not overwater
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Vitex agnus-castus, Chaste treemint family--Lamiaceae
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Vitex agnus-castus, Chaste tree• Native to Europe• Name means “chaste lamb”; vitex refers to
plaiting, as in fences• ID: arborescent shrub to 25 ft; shrubby perennial
where colder; clusters of purple flowers; lvs aromatic, gray-green, palmately compound
• Value: flowers all season, nice leaves, handle as a shrub or small tree, can be underplanted; takes moderate wate, resists oak root fungus
• Care: moderate water; prune as desired (blooms on new growth)
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Spiraea douglasii, Douglas spiraea,rose family--Rosaceae
Native to PNW (N. Cal to BC)ID: deciduous shrub to 6 ft x 20 ft; tall narrow pink flower clusters; lvs narrow, to 3.5 in., green above and velvety white beneathValue: takes swampy conditions, wild plantings near streams; has pink flrs; Native Americans used for arrow shafts, digging sticksCare: Likes moisture, acid soil; can be invasive in moist situation
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Spiraea douglasii, Douglas spiraea,rose family--Rosaceae
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Amorpha californica, California false indigo
pea family--Fabaceae
• Shrubs, 6-8 ft• Purple flower stalks
with orange stamens• Tiny erect pea pods• Pinnately compound
leaves
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California false indigo, Amorpha californica
• Food plant for California dogface butterfly (state butterfly)
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Calycanthus occidentalis, western spicebush
Spicebush family--Calycanthaceae
George Hartwell
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Calycanthus occidentalis, Western spicebush
• Deciduous shrub, can become large and rangy; prune to control size, but will sacrifice one year’s flowers
• Spicy odor; some smell fishy, purchase or propagate when in bloom to be sure
• Grows in foothills around Shasta Lake, Whiskeytown Lake
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Calycanthus occidentalis, Western spicebush
• Native to California and north, growing along streambanks or moist hillsides
• ID: deciduous shrub, 10 x 10 ft; ovate, entire, aromatic leaves; magnolia-like maroon flowers
• Value: good in shade, nice flowers, nice winter fruits, yellow fall color
• Care: moderate water; blooms on current season’s growth; remove crowded stems annually
• Warning: Seeds can cause convulsions
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Woodwardia fimbriata, giant chain fern
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Woodwardia fimbriata, giant chain fern
Native to California, along streamsID: deciduous fern to 5 ft (can be 9 ft!); leaves pinnately divided (how many times??); no flowers (ferns reproduce by sporesValue: gorgeous green fern, not invasiveCare: partial to full shade; needs water; use near pond, a shaded wall, even shaded seep in desert
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Fern Life Cycle
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Verbena bonariensis, tall verbenaVerbena family--Verbenaceae
• Opposite leaves narrow & scratchy
• Tall, ‘see through’• Prolific seeder
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Verbena bonariensis, tall verbena
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Verbena bonariensis, tall verbena
• Native to South America; naturalized in parts of California…
• ID: wispy shrub, 6 x 3 ft, airy branching stems; flrs tubular, purple, in dense clusters; lvs mostly basal
• Value: drought and heat tolerant; airy quality, purple flrs
• Care: little water, deadhead for rebloom; self sows freely…
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Vitis californica, California wild grape
• Riparian forest is relict of 20 million years ago
• Trees winter deciduous• Makes good farmland, so
90%+ now converted for agriculture
• Wild grape, Vitis californica, along stream corridors below 4000 ft. elev. is an indicator of this habitat
• ‘Roger’s Red’ is a hort form
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Vitis californica, California wild grape
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Buddleia x weyeriana ‘Honeycomb’, Honeycomb butterfly bush
Scrophulariaceae
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Buddleia x weyeriana ‘Honeycomb’, Honeycomb butterfly bush
• Large, semi-evergreen shrub that attracts butterflies
• Takes moderate water, sun• Prune after bloom, by cutting out the
oldest stems at the base of the plant• This is one of the better butterfly bushes,
that fills a gap in bloom, is fragrant, and is long lasting without too much deadheading
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Buddleia davidii, butterfly bushScrophulariaceae
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Buddleia davidii, butterfly bushScrophulariaceae
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Rhus lancea, African sumac, Anacardiaceae—Cashew family
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Rhus lancea, African sumac, Anacardiaceae—Cashew family
From South Africa, called “Karee”
Extremely drought-tolerant tree or large shrub
Dioecious--sexes separate, pollen allergenic
Requires some fussing to look its best (suckers)
Fruit is edible and has been used to make beer
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Abelia x grandiflora, Glossy abelia, Caprifoliaceae; honeysuckle family
• Cross between two Chinese species
• Grows 8 x 5 ft. Evergreen or semi-evergreen: loses leaves at 15 F., freezes to ground at 0 F (but does not die); fruit clusters interesting, flrs. white and fragrant, bloom summer and fall
• Leaves opposite!!
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Platanus racemosa, California sycamore
• leaf lobes entire,• very hairy
underneath; • fruits spherical,
zigzag on stalk
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Platanus racemosa, California sycamore
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Artemisia ‘Powis Castle’sunflower family--Asteraceae
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Artemisia ‘Powis Castle’sunflower family--Asteraceae
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Philadelphus lewisii, wild mock orangehydrangea family--Hydrangeaceae
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Philadelphus lewisii, wild mock orange
• Arching branches• Opposite leaves
with widely spaced teeth, 3-veined from the base
• 4-petaled fragrant flowers
• Blooms on last year’s wood
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Clerodendrum bungei, Cashmere Bouquet
mint family--Lamiaceae
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Clerodendrum bungei, Cashmere Bouquet
mint family--Lamiaceae
•Tropical look•Needs regular water, shade
•Large opposite leaves with distinctive odor
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Erigeron karvinskianus, Santa Barbara daisy
sunflower family--Asteraceae
•Pink and white daisies with yellow centers
•Drought tolerant, full sun
•Mounded form
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Erigeron karvinskianus, Santa Barbara daisy
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Ulmus glabra ‘Camperdownii’, Camperdown elm
elm family--Ulmaceae
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Ulmus glabra ‘Camperdownii’, Camperdown elm
•Large trees, weeping•Leaves double-toothed, edges not meeting at base (oblique or asymmetric base); very rough to touch
•Branches will touch ground
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Hydrangea macrophyllaBigleaf Hydrangea
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Hydrangea macrophylla Bigleaf Hydrangea
• Opposite leaves• 6 inches long• Simple leaves
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Hydrangea macrophylla Bigleaf Hydrangea
• Inflorescence is a corymb
• Bloom color affected by soil pH.
• Acidic soil (pH below 6) flowers are blue
• Alaline soil (pH above 6) flowers are pick