100 good Rock Plants for Washington Gardens - Don Humphrey (Potowmack Papers 36:1, 2000)
There are numerous other rock garden plants that can be grown here. These good plants, mostly easy from seed, would be ideal plants to grow for sales, exchanges, and our own gardens. No bulbs and no difficult-to-start plants.
Key s= sun, sh = shade, psh = part shade, wd = well drained soil, ord = ordinary garden soil, m = moist soil
(t) = suitable for troughs (w) = good wall plants
Sowing: degrees Fahrenheit at which to grow the plants. 40/70 means two or three months at around forty degrees followed by temperatures around 65 - 70 degrees. 55-70 indicates a temperature range at which seed will germinate.
Species Position Sowing
Aethionema grandiflorum s-wd 55-70
Allium stellatum s/psh 55-70
Alyssoides utriculata s/psh-ord 55-70
Alyssum montanum s-wd 55-70
Anemone baicalensis slpsh-or 55-70
Anemone crinita slpsh-ord 55-70
Aquilegia barnebyi s-wd 55-70
Aquilegia desertorum s-wd 55-70
Aquilegia flabellata s/psh-ord 55-70
Aquilegia glandulosa s/psh-ord 55-70
Arabis alpina s-wd 55-70
Arabis caucasica s-wd 55-70
Arisaema flavum psh/sh-m 55-70
Arisaema sikokianum psh/sh-m 55-70
Armeria juniperifolia s-wd 55-70
Armeria maritima s-wd 55-70
Aster alpin us s-wd 55-70
Aster tongolensis s-wd 55-70
Astilbe chinensis pumila psh-m 55-70
Astilbe simplicifolia psh-m 55-70
Aubrieta deltoides s-wd (w) 55-70
Calylophus hartwegii s-wd 55-70
Campanula carpatica s/psh-ord 55-70
Chrysopsis canescens s-ord 55-70
Clinopodium georgianum s-wd 55-70
Delosperma ashtonii s-wd 55-70
Delosperma cooperi s-wd 55-70
Delphinium grandiflorum s/psh-ord 55-70
Dianthus alpinus s-wd 55-70
Dianthus haematocalyx s-wd (w) 55-70
Dianthus petraeus s-wd (w) 55-70
Dicentra eximia s/psh-m 40/70
Draba aizoides s-wd (t) 55-70
Draba hispanica s-wd (t) 55-70
Dracocephalum ruyschianum s-wd 55-70
Erigeron compositus s-wd (t) 55-70
Erinus alpinus s-wd (t) 55-70
Evolvulus arizonica s-ord 70
Gentiana austromontana psh-ord/m 40/70
Gentiana scabra psh-ord/m 40/70
Gentiana septemfida psh-ord/m 40/70
Globularia cordifolia s/psh-wd (t) 55-70
Helianthemum nummularium s-wd/ord 55-70
Heuchera pulchella s/psh-wd/ord 55-70
Heuchera sanguinea s/psh-ord 55-70
Hosta venusta psh/sh-ord/m 55-70
Hypericum olympicum s-wd 55-70
Iberis saxatilis s-wd 55-70
Iberis sempervirens s-wd 55-70
Indigofera pseudotinctoria s-wd (nick?)55-70
Iris gracilipes s/psh-ord/m 40/70
Iris innominata s/psh-ord/m 40/70
Jasminum parkeri s/psh-wd 55-70
Lathyrus vernus s/psh-ord 40/70
Lewisia cotyledon s-wd (w/t) 40/70
Oenothera brachycarpa s-wd (w) 40/70
Oenothera pilosella s/psh-ord 55-70
Omphalodes luciliae psh/sh-ord/m 55-70?
Omphalodes verna psh/sh-ord/m 55-70?
Penstemon barbatus (dwarf) s-wd 40/70
Penstemon dissectus s-wd 40/70
Penstemon fruticosus psh-wd 40/70
Penstemon hirsutus v. pygmaeus s-wdlord 40/70
Penstemon pallidus s-wd/ord 40/70
Penstemon serrulatus psh-wd/m 40/70
Penstemon venustus psh-wd/m 40/70
Polemonium reptans psh/sh-m 40/70
Poliomintha longiflora s/psh-wd/ord 55-70?
Potentilla megalantha s/psh-wd/ord 55-70
Primula capitata s/psh-m 40/70
Primula cortusoides psh-m 40/70
Primula saxatilis psh-m 40/70
Primula sieboldii psh-m 40/70
Pulsatilla albana s/psh-wd 55-70
Pulsatilla patens s/psh-wd 55-70
Pulsatilla vulgaris s/psh-wd 55-70
Rosularia sempervivoides s-wd (t) (w) 55-70
Schivereckia doerfleri s-wd (t) 55-70
Schivereckia podolica s-wd (t) 55-70
Sedum cauticola s-wd (w) 55-70
Sedum pilosum s-wd (w) (t) 55-70
Sempervivum montanum s-wd (w) (t) 55-70
Sempervivum tectorum s-wd (w) (t) 55-70
Silene carolinianum s/psh-wd/m 40/70,70
Sisyrinchium macrocarpum s-ord 40/70
Spigelia marilandica s/psh-ord 40/70?
Spiraea japonica alpina s/psh-ord 55-70 -
Stipa tenuissima s-wd 55-70
Talinum calycinum s-wd (t) 40/70
Teucrium polium s-wd (w) 50-70
Thalictrum coreanum psh/sh-m 50-70?
Thalictrum kiusianum psh/sh 50-70?
Thlaspi alpinum s-wd (t) 50-70
Thlaspi bellidifolium s-wd (t) 50-70
Thlaspi rotundifolium s-wd (t) 50-70
Thymus richardii nitida s-wd (t) 50-70
Townsendia parryi et al w-wd (t) 50-70
Trollius acaulis s/psh-m 40/70
Veronica gentianoides s/psh-wd/m 40/70?
Viola bertolonii s/psh-wd/m 40/70
Viola corsica s/psh-wd/m 40/70