Slide 1

Hort 28 McConnell Arboretum and Gardens

Slide 2

Perovskia atriplicifolia, Russian sage

Slide 3

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

Slide 4

Solanum laxum, potato vine nightshade family--Solanaceae Vine for fence, trellis At edge of its hardiness in Reddingmay be killed in cold winter Poisonous foliage (all nightshades) and fruits (some nightshades)

Slide 5

Solanum laxum, potato vine nightshade family--Solanaceae

Slide 6

Rosa chinensis Mutabilis China rose rose family--Rosaceae

Slide 7

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

Slide 8

Rosa Sally Holmes Roses have alternate, pinnately compound leaves WiTH STIPULES Nodal 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

Slide 9

x Chitalpa tashkentensis Pink Dawn catalpa family--Bignoniaceae

Slide 10

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

Slide 11

Vitex agnus-castus, Chaste tree mint family--Lamiaceae

Slide 12

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)

Slide 13

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 beneath Value: takes swampy conditions, wild plantings near streams; has pink flrs; Native Americans used for arrow shafts, digging sticks Care: Likes moisture, acid soil; can be invasive in moist situation

Slide 14

Spiraea douglasii, Douglas spiraea, rose family--Rosaceae

Slide 15

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

Slide 16

California false indigo, Amorpha californica Food plant for California dogface butterfly (state butterfly)

Slide 17

Calycanthus occidentalis, western spicebush Spicebush family--Calycanthaceae George Hartwell

Slide 18

Calycanthus occidentalis, Western spicebush Deciduous shrub, can become large and rangy; prune to control size, but will sacrifice one years flowers Spicy odor; some smell fishy, purchase or propagate when in bloom to be sure Grows in foothills around Shasta Lake, Whiskeytown Lake

Slide 19

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 seasons growth; remove crowded stems annually Warning: Seeds can cause convulsions

Slide 20

Woodwardia fimbriata, giant chain fern

Slide 21

Native to California, along streams ID: deciduous fern to 5 ft (can be 9 ft!); leaves pinnately divided (how many times??); no flowers (ferns reproduce by spores Value: gorgeous green fern, not invasive Care: partial to full shade; needs water; use near pond, a shaded wall, even shaded seep in desert

Slide 22

Fern Life Cycle

Slide 23

Verbena bonariensis, tall verbena Verbena family--Verbenaceae Opposite leaves narrow & scratchy Tall, see through Prolific seeder

Slide 24

Verbena bonariensis, tall verbena

Slide 25

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

Slide 26

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 Rogers Red is a hort form

Slide 27

Vitis californica, California wild grape

Slide 28

Buddleia x weyeriana Honeycomb, Honeycomb butterfly bush Scrophulariaceae

Slide 29

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

Slide 30

Buddleia davidii, butterfly bush Scrophulariaceae

Slide 31

Slide 32

Rhus lancea, African sumac, AnacardiaceaeCashew family

Slide 33

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

Slide 34

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!!

Slide 35

Platanus racemosa, California sycamore leaf lobes entire, very hairy underneath; fruits spherical, zigzag on stalk

Slide 36

Platanus racemosa, California sycamore

Slide 37

Artemisia Powis Castle sunflower family--Asteraceae

Slide 38

Slide 39

Philadelphus lewisii, wild mock orange hydrangea family--Hydrangeaceae

Slide 40

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 years wood

Slide 41

Clerodendrum bungei, Cashmere Bouquet mint family--Lamiaceae

Slide 42

Tropical look Needs regular water, shade Large opposite leaves with distinctive odor

Slide 43

Erigeron karvinskianus, Santa Barbara daisy sunflower family--Asteraceae Pink and white daisies with yellow centers Drought tolerant, full sun Mounded form

Slide 44

Erigeron karvinskianus, Santa Barbara daisy

Slide 45

Ulmus glabra Camperdownii, Camperdown elm elm family--Ulmaceae

Slide 46

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

Slide 47

Hydrangea macrophylla Bigleaf Hydrangea

Slide 48

Opposite leaves 6 inches long Simple leaves

Slide 49

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