For bloom after July first the list is not long. It is unfortunate that the peak of the bloom is in the spring, though many herbs (and, of course, patio statuary) give some bloom for all summer. With all the new plants discovered on distant peaks, very few are summer bloomers at low altitudes.

*Allium stellatum, Prairie Onion

*Anaphalis margaritacea, Pearl Everlasting

*Aster linariifolius, Pine Aster

*Ptarmicoides, White Upland Aster

*Boltonia latisquama nana, Dwarf Pinkray Boltonia

*Chrysanthemum arcticum, Arctic Chrysanthemum

*Chrysopsis falcata, Sickle-leaf Golden-Aster

*Cimicifuga japonica, Japanese Bugbane

*Simplex, Kamchatka Bugbane

*Crocus sativus, Saffron Crocus

*Speciosus, Showy Crocus

*Zonatus, Banded Crocus, etc.

*Linaria alpina, Alpine Toadflax

*Paronychia dichotoma, Forked Nailwort

*Sedum ewersii, Ewers Stonecrop

*Sieboldii, Siebold Stonecrop

*Spectabile nanum, Dwarf Showy Stonecrop

*Silene schafta, Schafta Catchfly

*Solidago caesia, Wreath Goldenrod

*Cutleri, Cutler Alpine Goldenrod

*Tunica saxifraga, Saxifrage Tunicflower

*Zephyranthes Candida, Autumn Zephyr-lily

Walks and Stepping Stones

For the crevices in walks surfaced with flat stones, only the most dwarf or strong of rock plants should be planted. Fleshy plants, as Sedums, are too slippery when walked on, and Iberis and Alyssum become hurdles over which the traveler must leap.

*Acaena microphylla, New Zealand Bur

*Antennaria neodioica, Smaller Pussytoes

*Plantaginifolia, Plantainleaf Pussytoes

*Arenaria montana , Mountain Sandwort

*Verna, Tufted Sandwort

*Verna caespitosa, Moss Sandwort

*Cotula squalida, Creeping Mayweed

*Dianthus caesius, Cheddar Pink

*Draba olympica, Olympic Whitlowgrass

*Epilobium nummularifolium, Moneywort Willowweed

*Gypsophila repens, Creeping Gypsophila

*Cerastioides, Mouse-ear Gypsophila

*Herniaria glabra, Burstwort

*Houstonia serpyllifolia, Creeping Bluets

*Paronychia argyrocoma, Allegheny Nailwort

*Sagina glabra, Smooth Pearlwort

*Sempervivum arachnoideum, Spiderweb Houseleek

*Silene acaulis, Moss Campion

*Statice montana , Alpine Thrift

*Stellaria longipes, Long-stalk duckweed

*Thymus serpyllum albus, Whiteflower Thyme

*Lanuginosus, Woolly Thyme

*Veronica repens, Creeping Speedwell

*Rupestris nana, Dwarf Cliff Speedwell

*Saxatilis, Rock Speedwell

*Serpyllifolia, St. Paul Speedwell

Acid Soil Rock Plants

Fortunately, most rock plants will thrive in either acid or lime soil. Several groups of plants prefer acid soil conditions, particularly in conjunction with constant moisture and leafmold. The following grow readily in sunny spots, but not where the soil is at all alkaline. No list of any length on this subject has yet been compiled. These are the calciphobe or calcifuges plants, since they hate lime and flee from it. The Heath, Lily, and Orchid families are good examples. Try the aluminum sulfate treatment on them if the soil is not naturally acid and use plenty of peat in the soil mixture.

*Achillea atrata, Black Yarrow

*Moschata, Musk Yarrow

*Androsace alpina, Alpine Rock-jasmine

*Carnea, Pine Rock-jasmine

*Anemone alpine sulfurea, Yellow Alpine Anemone

*Blanda, Greek Anemone

*Quinquefolia, American Wood Anemone, etc.

*Arethusa bulbosa, Arethusa

*Astilbe simplicifolia, Star Astilbe

*Calopogon pulchellus, Grass-pink Orchid

*Calypso borealis (Calypso bulbosa), Calypso

*Chimaphila maculata, Striped Pipsissewa

*Cumbellata, Common Pipsissewa

*Chiogenes hispidula, Creeping Snowberry

*Coptis trifolia, Goldthread

*Epigaea repens, Trailing-arbutus

*Gaultheria procumbens, Wintergreen

*Gentiana affinis, Sierra Gentian

*Alpina, Alpine Gentian

*Cruciata, Cross Gentian

*Kochiana, Koch Gentian, etc.

*Houstonia caerulea, Bluets

*Iris verna, Vernal Iris

*Linnaea borealis, Twinflower

*Moneses uniflora, Oneflower Wintergreen

*Orchis spectabilis, Showy Orchid

*Parnassia caroliniana, Carolina Parnassia

*Palustris, Marsh Parnassia

*Pogonia ophioglossoides, Rose Pogonia

*Potentilla tridentata, Wineleaf Cinquefoil

*Primula elatior, Oxlip Primrose

*Farinosa, Birdseye Primrose

*Viscosa, Clammy Primrose, etc.

*Pyrola elliptica, Shinleaf

* Shortia galacifolia, Oconee-bells

*Sibbaldia procumbens, Creeping Sibbaldia

*Silene rupestris, Cliff Catchfly

*Soldanella (all species)

*Streptopus roseus, Rosy Twistedstalk

*Thalictrum dioicum, Early Meadowrue

*Minus, Low Meadowrue

*Trillium nivale, Dwarf Trillium

*Trivale, Brook Trillium

*Trollius chinensis, Chinese Globeflower

*Laxus, American Globeflower