perennials that do not
rebloom after, 104, 357
perennials that do not
require, 104, 363–364
perennials that require
frequent, 104
in planting / maintenance
schedule, 387, 388, 390
plants with flower spikes,
96, 100
to prevent disease entry,
66
reasons for, 95
reasons for not, 103, 105
reseeding and, 100, 103–
105, 132, 361–362
before seeds mature if
seeding is not desired,
100 , 361–362, 387
then cutting back to basal
foliage, 111–112, 367
with your fingers, 98
deadheads, aesthetics of, 98,
103, 133, 363
deadleafing, 63, 111, 127, 134,
371, 382, 387, 388
dead nettle, 255
deer as pests, 73
deer-resistant perennials, 63,
350–351
Delphinium ×belladonna
‘Bellamosum’, 76, 196
delphinium / Delphinium,
356, 359, 367, 370, 372,
37 4, 375, 377
cutting back, 111, 384, 38 7
disbudding, 126
fertilizer needs, 55
Pacific Giant hybrid, 23, 25,
76
slugs as pest of, 68
Delphinium elatum, 196 , 346,
348, 351, 352, 358
‘Blue Fountains’, 196
‘Blue Lace’, 197
Connecticut Yankee Series,
196
‘Ivory Towers’, 197
Mid-Century Hybrids, 197
‘Moody Blues’, 197
‘New Millenium Stars’, 197
New Millennium Series,
197
‘Rosy Future’, 197
‘Royal Aspirations’, 197
‘Ultra Violets’, 197
Delphinium grandiflorum
‘Blue Butterflies’, 196
Dennstaedtia punctilobula,
350
depth and balance in design,
126
Deschampsia cespitosa, 228
‘Northern Lights’, 228
Desmodium canadense, 345
Dianthus ×allwoodii, 197 , 346,
348, 356, 358
Dianthus barbatus, 100, 198 ,
346, 352, 361, 362, 366,
371
‘Sooty’, 198
Dianthus carthusianorum,
200
Dianthus deltoides, 109, 130,
198 , 199, 348, 352, 361,
362, 365, 366
dianthus / Dianthus, 32, 71,
344, 350, 370, 372, 374,
375
Dianthus gratianopolitanus,
134, 199 , 347, 353, 356,
366
‘Bath’s Pink’, 29, 200
‘Feuerhexe’ Firewitch, 199,
200
‘Shooting Star’, 200
Star Series, 200
‘Tiny Rubies’, 200
Dianthus plumarius, 197
diatomaceous earth, 68
dicentra, 49, 65
Dicentra eximia, 200, 350
Dicentra formosa, 200
‘Alba’, 200
‘Luxuriant’, 200 , 201, 346,
348, 353, 356, 358, 360,
371, 375, 377
‘Zestful’, 201
Dicentra spectabilis, 201
Dictamnus, 25, 50
Dictamnus albus, 201 , 347,
350 , 355, 363, 369, 370,
372, 37 4
deadheads, 103
digitalis / Digitalis, 81, 100,
350 , 356, 359, 370, 372,
37 4, 375
‘Mertonensis’, 202
Digitalis grandiflora, 70, 201 ,
202, 347, 353, 361, 362,
367
‘Carillon’, 141, 202
‘Temple Bells’, 387
Digitalis lutea, 202
Digitalis ×mertonensis, 202Digitalis purpurea, 29, 75,
202 , 346, 352, 361, 362,
366, 371
‘Foxy’, 202
dill, 65
disbudding, 89–90, 116,
126–127
disease problems, 66–68, 132
division, 352, 353, 354, 355
alternatives to, 81
double-fork method, 81
during garden renovation,
61
in planting / maintenance
schedule, 382, 383, 389
techniques and care, 81
timing by season, 79–80
dogs for pest control, 73
doronicum / Doronicum, 203,
352, 360, 361, 362, 366
Doronicum orientale, 203
‘Finesse’, 203
‘Leonardo Compact’, 203
‘Little Leo’, 203
dotted blazing star, 258
double digging, 40
double fernleaf peony, 66
double Japanese aster, 170
downy amsonia, 153
drainage tiles, 33
drifts, 26, 27
drifts in design, 26, 27
dropwort meadowsweet, 213
drumstick primrose, 296
dry conditions, 51–52, 344
Dryopteris erythrosora, 211,
212
‘Brilliance’, 212
Dryopteris filix-mas, 212early phlox, 286
Eastern bluestar, 153
East Indies aster, 169
Echinacea angustifolia, 205
echinacea / Echinacea, 64,
105, 130, 204, 241, 344,
386, 390
Echinacea hybrids
‘Fragrant Angel’, 205
‘Hot Papaya’, 205
‘Marmalade’, 205
‘Milkshake’, 205
‘Pink Double Delight’, 205
Echinacea pallida, 205
Echinacea paradoxa, 205
Echinacea purpurea, 204 , 345,
350 , 354, 356, 358, 359,
361, 362, 364, 368, 374,
37 5, 377