If the garden contains shrubs that will serve as background for small, shy woodland plants, that’s fine. If it doesn’t, you may want to plant some (these, too, are available by mail), because few native woods plants are spectacular enough to make a big display of their own. And because woods plants are modest, they’re best planted in colonies a half dozen or more of one species, not in mixed colors or varieties. Set the groups in the foreground, where they’re easy to see. Allow plenty of space between groups for natural increase without crowding. Arrange more striking, tall, spiky plants here and there to add the interest of accent, just as you would in a conventional flower bed.
Care after planting includes the expected careful watering, and keeping the plants moist and shielded from heat and wind until they are growing on their own. For their first winter, you may want to supplement the natural mulch of leaves with salt hay or something similarly light and airy, held in place by chicken wire or branches. This mulch must be removed extra early for early-flowering species. By their second season the plants should be ready to be watered by rain, and fed and protected by trees, without your help. Don’t fiddle with them, pull off leaves or seed pods, or move them about unless you must.
PROPAGATING WOODLAND PLANTS
These are, of course, hardy perennials. Except for seeds, propagating methods are much the same as for cultivated types. It is important only that, if possible, you find out what is the most effective (often, the only) way each plant can be reproduced. If you can’t track down this information, try several ways at once. In general, those with masses of fibrous roots can be divided immediately after flowering. For upright and branching types, you can usually root stem cuttings in a frame or propagating box. If everything else fails, try layering. You can’t lose anything by it.
Seeds are planted the minute they are ripe, in a cold frame—or in flats that can be set in the cold frame—in a finely sifted mixture of equal parts of loam, woods leaf mold, and coarse sand. For varieties adapted to extremely acid soil, use half as much coarse sand as Michigan peat, without soil. For added insurance, acidify the planting mix with leaf mold or peat, or neutralize it with lime, until the pH is somewhere near that of the soil the plant grows naturally in.
Set the flats in shade and keep the soil moist, and leave the seeds to their own devices, summer and winter, until they germinate. Some species take two months, some take two years. After germination they are handled exactly like other perennial seedlings, except that the only safe fertilizer is very weak liquid manure at very infrequent intervals. Tender types should be grown in pots until they are fully mature, before they’re set out in the garden.
PLANTS FOR WOODLAND GARDENS
Aquilegia canadensis Ranunculaceae Columbine
Although the native Eastern columbine can grow two feet tall, it seems to stay closer to six inches in my woodland garden and on the banks that line our Pine Tree Road. The clover-like leaves, and characteristic columbine flowers with yellow sepals and knobbed red spurs, are scaled down proportionately.
CARE. Poor, dry soil, acid (strong to neutral). Fertilizer promotes growth that is too rank. Full sun to three-quarter shade.