Perennials
A perennial plant is one which lives for more than two years, as opposed to annual plants which survive only one year or growing season. The term "Perennials" typically applies to winter-hardy herbaceous plants in a specific climate zone. Some plants may be perennial in some warmer zones, but only annuals in the colder climate zones. Perennials grow and bloom over the warmer seasons of spring of summer, and then die back in the cooler seasons of autumn and winter. They return the next growing season by using the nutrients built-up in their roots during the past growing season(s).
achillea, aegopodium, agastache, ajuga, alcea, alchemilla, allium, alyssum, ampelopsis, amsonia, aquilegia, arabis, arenaria, armeria, artemesia, aruncus, asarum, asclepias, aster, astilbe, astrantia, aubrieta, aurinia
baptista, bellis, bergenia, boltonia, brunnera, buddleia
calamintha, callirhoe, campanula, caryopteris, celastrus, chelone, centaurea, clematis, convallaria, coreopsis
delosperma, delphinium, dianthus, dicentra, dictamnus, digitalis
echinacea, erigeron, eryngium, eupatorium, euphorbia
ferns
gaillardia, geranium, geum, gypsophila, grasses
helenium, heliopsis, helleborus, hemerocallis, heuchera, heucherella, hibiscus, hosta, houttuynia
iberis, iris
kniphofia
lamium, lamiastrum, lathyrus, lavandula, lavatera, leptinella, leucanthemum, liatris, ligularia, lilium, linum, lobelia, lupinus, lychnis, lysimachia
monarda, myostis
nepeta
oenothera, origanum
paeonia, papaver, penstemon, perovskia, phlox paniculata, phlox, subulata, physostegia, platycodon, polemonium, polygonatum, polygonum, potentilla, pulmonaria, pulsatilla, pyrethrum
ranunculus, rudbeckia
salvia, saponaria, scabiosa, sedum, sempervivum, sidalcea, silene, solidago, stachys, statice, stokesia
thymus, tiarella, tradescantia
verbascum, veronica, vinca minor
yucca
