The Well-Tended Perennial Garden The Essential Guide to Planting and Pruning Techniques, Third Edition
Pruning is often tailored to species. ‘Carillon’ yellow foxglove (Digitalis grandiflora ‘Carillon’) can be deadheaded to basal f ...
Acanthus spinosus Spiny bear’s breeches a canthaceae Spikes of mauve flowers; shiny thistlelike leaves 3–4 ft. (2–2 1/2 ft.) hig ...
in cooler climates. Slug and snail damage is often a problem. Well-draining soil is critical. Benefits from a winter mulch in no ...
Achillea filipendulina ‘Credo’ has large yellow flowers and strong stems that don’t require staking. Achillea filipendulina ‘Gol ...
Achillea millefolium common yarrow compoSitae Flat heads of red, white, or pink flowers; ferny, dark green leaves 2–3 ft. high; ...
long-blooming cultivar with dead- heading that can go strong for 6 weeks and then sporadically for a total of 15 weeks. May need ...
Aconitum napellus monkshood ranunculaceae Blue-violet spikes of hooded flowers; deep green palmately divided foliage (lobed or d ...
May or early June. Tough to establish, but once it takes hold ‘Ivorine’ even seeds itself a bit if not deadheaded. Aconogonum ‘J ...
Actaea racemosa black cohosh ranunculaceae White, bottlebrush-shaped, ill-scented flowers; ferny leaves 4–6 ft. (3 ft.) high; 2– ...
Actaea pachypoda ‘Misty Blue’ has glaucous blue-green leaves. Actaea simplex, Kamchatka bug- bane, resembles A. racemosa but is ...
Ajuga reptans bugleweed lamiaceae Blue, white, or pink flowers; green, variegated, or purple leaves 6–9 in. (2 in.) high; 24 in. ...
once or twice before flowering to create later blooming, shorter plants that don’t require staking. Flower spikes will be smalle ...
Alchemilla mollis lady’s mantle r oSaceae Frothy chartreuse flower heads; round, scalloped, soft, smoky yellow-green leaves 15–1 ...
or fall every 6–10 years. Lady’s mantle is very effective when repeated along a border. Amsonia^ tabernaemontana Eastern bluesta ...
Amsonia elliptica has wider, glossier leaves than A. tabernaemon- tana. Its rounded, shrubby form holds up fairly well in full s ...
buds when flowers fade to keep plants looking fresh. Foliage declines if grown in too dry a soil, thus requiring deadleafing. If ...
short-lived perennial that deteriorates after the 2nd year and must be divided. Plants do not respond well to autumn planting. H ...
afternoon sun in hot locations. Divide every 10 years in the spring if needed to renew clump. Fall transplanting is fatal; sprin ...
Angelica gigas purple angelica, Korean angelica apiaceae Bold dissected foliage; 4- to 8-in.-wide burgundy flower heads 3–6 ft. ...
dry soil will take its toll, as will overly wet soil, which leads to crown rot. Avoid locations with hot afternoon sun. Taller f ...
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