The peak of the blooming season is in the Spring, which is unfortunate for keeping blooms in your garden setting during the summer months. There are few summer blooms, that are not herbs, that can bloom at low altitudes during summer months.
Here are some to consider:
*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 Steppers:
For walks surfaced in flat stone with crevices, usually only rock or dwarf plants will grow. Fleshy plants, like Sedums, become very slippery when they are walked on. Other plants like, Iberis and Alyssum are hurdles to travel over.
Here is some plants to consider:
*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
Rock Plants:
Most rock plants will thrive in acidic based or lime soils. There are many groups of plants that love acidic soil, especially if the soil contains constant moisture and lead mould. The list below grow well in sunny spots where the soil is not alkaline based. There is not a lengthy list on this subject. You can try to an aluminum sulfate treatment if the soil is not naturally acidic, using 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