April Garden Calendar – What To Do
In Northern United States and Canada
Plant trees, shrubs and vines that lose their leaves in Winter just as early as possible and surely before they have made much new growth. Roses are included in this group. Evergreens may be planted from the first time in Spring when the ground is in condition to work until their new shoots begin to push out. Do not delay the planting or the lifting, division, and replanting of perennials that you intend to give these attentions to this Spring. Bulbs of Lilies may be planted now.
During the early part of the month check the rock garden carefully and replace any plants that have died. Cultivate the surface soil lightly and add a top-dressing of screened rich soil. Restrain vigorous spreaders from out crowding their neighbors. Lift, divide and replant specimens in need of this treatment. In general, divide Summer and Fall bloomers now, and early Spring-bloomers after blooming or in early Fall.
Practically all annuals can be sown outdoors in April. All vegetables that are fairly hardy, such as Beets, Carrots, Turnips, Radish, Spinach, Swiss Chard, Lettuce and Onions may be sown now. Don’t sow tender kinds, such as Corn, Squash and Beans, until next month. Lift, divide and replant old clumps of Rhubarb. After the middle of the month, when the ground has warmed up, make a first planting of Gladioli outdoors and plant other plantings at about two-week intervals. Set out divisions of Dahlia roots toward the end of the month. Plant seeds of annual herbs, such as Parsley, Basil, Summer Savory, Sweet Marjarum and Borage as soon as the ground is workable. Seeds of Thyme and Sage may be sown at the same time.
Lawn conditioning and renovation needs early attention. Raking to remove debris, top-dressing with a sifted highly organic soil enriched with fertilizer or, if this is not possible, fertilizing with a good lawn fertilizer, reseeding bare spots and rolling when the ground is fairly dry should be “musts” in the Spring program. Only if a test indicates excessive acidity should lime be applied. Apply herbicides to lawns and other areas as recommended by their manufacturers. Use the hoe and cultivator frequently and vigorously to cut down young weeds in beds, borders and in the vegetable garden.
Put into effect carefully worked out spray programs to protect Roses, Lilies, Peonies, Tulips, fruit trees and bushes and other garden plants from expected attacks by disease and insect enemies. In the greenhouse it is easy to increase Dahlias from cuttings now. Pot rooted cuttings of all types of plants that were propagated earlier. Meticulous attention to such routine matters as shading, ventilating, damping down, syringing, watering and fertilizing are of the utmost importance in the greenhouse.
In the South
It is not too late to renovate old lawns or to plant new ones like silk plants. . . Prune early-flowering shrubs, such as Forsythias, Jasmines, Deutzias, Flowering Quinces and Spireas as soon as their flowers have faded. . . . Frost-tender annuals and bedding plants may now be set out as well as tender vegetables, such as Tomatoes. Continue to make succession sowings of vegetables. Mulch Strawberries with straw, Pine needles or other material that will keep the berries clean. . . Sow seeds of heat-resistant annuals outdoors. Here belong Zinnias, Salvias, Petunias, Morning Glories, Sunflowers, Marigolds, Cosmos, Tithonias, Four O’clocks, Castor Beans, Amaranthus and Moonflowers. Keep the flowers picked or the faded flowers removed from early sown annuals.
On the West Coast
Give prompt attention to whatever pruning is needed by early Spring-blooming shrubs just as soon as the flowers fade. In northern sections set out plants of perennials and rock garden subjects. Annuals of all kinds may be sown and planted now. The tenderer kinds must not, of course, be sown or planted until danger of late frosts is over. The same remarks apply to vegetables and silk house plants.
Dahlias planted in April provide a fine showing of bloom later. These handsome flowers need a sunny location. Make successive plantings of Gladioli. Tuberoses and Montbretias. Attend to pinching, staking and cultivating in the flower garden to encourage orderly and satisfactory growth. Keep a keen eye open for the first evidence of pests and diseases.
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