February To-Do List for Zone 4
March To-Do List For Zone 4
Start seeds of slow growers—such as pansies, onions, leeks, and celery—under lights this month.
If snow isn't too deep, prune dead or damaged branches from fruit trees, brambles, and shrubs.
Try raising an indoor crop of leaf lettuce beneath lights.
Fertilize houseplants that show signs of new growth.
April To-Do List for Zone 4
and mountain ash trees, prune away branches killed by fire blight to
prevent further spread of the disease; also prune black knots off of
cherries. Make cuts 1 foot below the diseased area. Disinfect pruners
with a 10 percent bleach solution between cuts.
Start pepper and eggplant seeds indoors under lights.
Start seeds of zinnias, salvia, petunias, and nicotiana indoors under lights.
Pot up seedlings started last month and potbound houseplants.
Don't rush to remove mulch from perennials: The sun could heat the
soil and stimulate new growth, which the hard freezes still to come
May To-Do List for Zone 4
When the soil has warmed and dried, plant cold-tolerant crops, such as peas, spinach, lettuce, radishes, and onion.
In flowerbeds, plant lilies, primroses, and lilies-of-the-valley.
Plant raspberries as soon as possible, but wait until the soil has begun to warm before planting strawberries.
Dig and divide perennials, such as daylilies and irises.
Indoors, start tomato seeds if you plan to set them out under protective covering next month.
Start broccoli seeds indoors for an early crop—but don't delay; soon it will be too warm.
June To-Do List for Zone 4
In the flowerbed, divide overgrown perennials, and establish new beds with the divisions.
Sow seeds of annual flowers such as bachelor's buttons, marigolds, and zinnias.
Start melon, cucumber, and squash seeds indoors or in a coldframe.
Plant frost-sensitive veggies—such as tomatoes, beans, and summer squash—at the end of the month.
Prune lilacs, azaleas, spirea, and other spring-flowering shrubs after they bloom.
July To-Do List for Zone 4
Early in the month, finish setting out transplants of vegetables and flowers.
Plant seeds of warm-weather crops, such as melons and squash.
Sow more lettuce so you can keep harvesting leaves, even after the first crop goes to seed.
Near month's end, plant cilantro to put in the salsa you'll make later.
Stake or cage tomatoes and other veggies and flowers that tend to sprawl.
Plant asters and pansies for fall bloom.
Spray Bacillis thuringiensis (BT) on brassicas as soon as you spot cabbage moths.
Mulch beds as soon as the soil warms up.
Sow a second planting of green beans and summer squash.
Use Bacillus thuringiensis on cabbageworms and other caterpillars.
Divide crowded iris and daylily clumps.
Spread mulch and irrigate to keep soil moist in dry weather.
Set out transplants for fall crops of broccoli, cabbage, and cauliflower.
Sow seeds of kale and Chinese cabbage for fall harvest.
Add new perennials to flowerbeds.
Remember that you can still plant potted or balled trees and shrubs, but water them well.