Perennials: As a preventive for fungal disease on roses, spray plants weekly with a mixture of 1 tablespoon of baking soda and 3 tablespoons of horticultural oil to 1 gallon of water. Removing spent flowers keeps them from producing hips or seeds. When cutting roses for bouquets, cut each rose just above a bud so that at least two five-part leaves remain where the branch joins the main stalk. Avoid overcutting new rose bushes the first year.
Flowers: Honeydew on plant leaves may mean aphids. A strong spray from the hose will remove most of these pests. Most herbs need no fertilizer and little water, so water only during prolonged dry spells. They abhor chemical treatments. Avoid mulching herbs because it keeps the soil too moist and will encourage fungus. If this occurs, cut them back to encourage new growth.
Vegetables and fruits: Side-dress beans and corn with general fertilizer unless the soil is already rich. Thin to 10 inches between corn plants and at least 8 inches between bean plants. Check potatoes for potato beetle. Hand-pick as soon as the tiny orange eggs appear. Plant more lettuce. Pick radishes before they grow too large and too hot.
Trees and shrubs: Prune dead and diseased wood and water sprouts from dogwoods and magnolias. Prune hedges so that the bottom is broader than the top — this lets in sunlight for the lower branches. Continue pruning spring-flowering shrubs.
Lawns: Compost grass clippings of just leave them on the lawn as fertilizer. Spot-treat weeds in the lawn.
Houseplants: Keep houseplants out of direct sun if you are putting them outdoors for the summer.
General: Control poison ivy with Roundup. Never put leftover pesticides or those transferred from damaged containers into unmarked containers or food or drink containers. Never store pesticides where they could contaminate human or animal feeds and don’t leave the containers where rain can wash the material into the ground.