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