The fragile, crinkly blooms of rockrose look like small, delicate, roses, but this tough, shrubby perennial can stand up to considerable heat and drought. In the wild, Helianthemum nummularium is found growing in open meadows and rocky, chalky sites across Europe and Asia Minor. It has a low, spreading habit and fine stems lined with small, fuzzy, gray-green leaves that resist water loss.
Common rockrose blooms from May to July. Its numerous, five-petaled flowers are bright pink, rose, white, red. In the center of each rose-like bloom is a fluffy cluster of bright yellow stamens. The flowers are highly attractive to bees and followed by inconspicuous brown fruits. The plants tend to become leggy after flowering, so it is advisable to gently shear them back in late summer. This will also encourage a second flush of flowers in fall.
Full sun is a must for good health. Rockrose does not fare well in heavy fertile soil but grows best in lean, gritty, alkaline soils. Too much care can kill a plant. Feed rarely and water deeply but not often.
This is a lovely rock garden plant, but it will also fare well in any raised garden or container with excellent soil drainage. Nothing is lovelier than a slope of rockrose in full bloom glowing against the west light of the setting sun.
Information source: http://learn2grow.com/plants/helianthemum-nummularium/
Genus - Helianthemum
Species - Nummularium
Variety - mix
Common name - Rock Rose
Pre-Treatment - Not-required
Hardiness zones - 6 - 8
Height - 0,30 m
Spread - 0,90 m
Plant type - Perennial flower
Exposure - Full Sun
Growth rate - Medium
Soil PH - Neutral, alkaline
Soil type - Loam, sand
Water requirements - Average, drought tolerant
Landscape uses - Container, Edging, Groundcover, Mixed Border, Rock Garden / Wall
Bloom season - May - July
Leaf / Flower color - Gray green / mix
Sow indoors from February to May in trays of seed compost or directly in seed bed outdoors from May to June (after the last frost).
Sow thinly, cover lightly with fine compost. Firm gently and keep moist. Cover with glass, clear plastic or propagator lid.
Keep at +15-+20C. Seedlings appear in 14-21 days.
Remove cover then seedlings appear. Grow on at ~+13-+15C.
Transplant when large enough in to 10 cm individual pots. Transplant in to permanent position after the last frost 45 cm apart.
Remove dead flowers to prolong flowering. Keep moist and weed free.
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