University
of Vermont Extension Department of Plant and Soil Science
University
of Vermont Extension 
Heuchera 'Raspberry Regal'
(hue' ker-ah)
Common name: Coral Bells, Alum Root, Crimson Bells
Family: Saxifragaceae, Saxifrage
Height x width:18-30" tall x 12-18" wide
Growth rate: moderate
Foliage: basal and evergreen, reniform to ovate or orbicular, 1"-3" wide; lobed margins; often pubescent on hairy petioles, green to dark purple, sometimes partly to mostly veined silver
Flowers: ¼-½" long bell-shaped, in cymose panicles on stems 18-30" tall, naked stems (no stem leaves); raspberry-red from sepals; early to mid summer
Hardiness: zones 3-8
Soil: well-drained, organic
Light: part shade, tolerates sun in north if sufficient moisture
Pests and problems: leaf spots, powdery mildew, leaf and stem smut, stem rot, strawberry root weevil, mealybug, foliar nematode
Landscape habit, uses: woodland and shade gardens or borders, cut flowers, bees and hummingbirds (especially red-flowered cultivars)
Other interest: cross of sanguinea and x brizoides; introduced by Busse Gardens, Cokato, MN; one of best coralbells for cut flowers; stems self-supporting; named for an 18th century German botanist J.H. von Heucher; similar to Tiarella only with 5 stamens in flowers rather than 10 for the latter, and showy parts usually sepals not petals as in latter; some intergeneric hybrids under x Heucherella; much breeding among this genus especially recently.
Other culture: plants easily frost heave as they are shallow-rooted, to avoid plant crowns 1" below soil surface and mulch; remove spend flower stalks for prolonged bloom and aesthetics; avoid heavy clay soils or soils with very acidic pH; many related cultivars perform better in the north than the south, being intolerant of excessive heat and humidity
Propagation: division when plant center becomes woody (every 3 years or so), leaf cuttings in late fall of leaves and short petiole segment in sand, seeds (500,000 seeds per ounce) sown in spring for following year flowering, tissue culture (mainly of new varieties)
Sources: Sunny Border Nurseries, Kensington, CT (wholesale); check your local garden stores, and online catalogs as well
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