Zone 4 - Monthly Garden Calendar: Chores and Planting Guide (2024)

Monthly Garden Schedule by Zone

By Angie Lavezzo

31Jul

Planting by USDA Zone is a good starting point to get a handle on what you should be thinking of planting and when. If you pair this overview of gardening tasks by zone with experience, local knowledge and good year on year note taking then you should have a pretty good annual gardening calendar!

If you haven’t already, now is a great time to prune your fruit trees, berry bushes, and other woody ornamentals on your property.
If you haven’t already direct sown flowers that benefit from stratification, you can sow outdoors seeds like Nigella, Poppy, and Larkspur so they get a few weeks of cold temps which will aid in their germination.
The longer days and shorter nights will stimulate your houseplants to start growing again. Now is a good time to repot them if needed and give them a good feeding.
Start seeds inside for broccoli, cabbage, cauliflower, celery, eggplant, head lettuce and parsley. Most perennial flowers should be started inside by the end of the month as well.
Avoid the spring rush and take your lawn mower and any other mechanized tools you use in for service.
On nice days, turn your compost pile. Resist working your garden soil! Working soil when it is still too cold and wet creates compacted clots.

April

Cut back dead stems of flowers and grasses, try cutting up these dried up stems and plants and leaving them scattered over the ground as a natural mulch. Your layer of old leaves and mulch is still doing its duty to protect the soil and perennials from late spring freezes.
Rearranging perennial plants can commence now except where the soil is too wet. If it sticks together in clods, stop and wait for it to dry. If clods break up with the poke of a finger or garden fork, it is safe to carry on. This is true for working up vegetable garden beds and places where you will plant annual flowers. It is a mistake that you may regret for the rest of the season.
Fertilize grapes, raspberries, and blueberries before growth resumes.
If you haven't already done so, sow seeds indoors of broccoli, early cabbage, cauliflower, celery, eggplant, and head lettuce. Peppers may be sown from seed indoors now, too. Tomato seeds should be sown in the 3^rd or 4^thweek of the month.
Now is a great time to get your soil tested to prep for the coming season. Check with your local Extension Agency for instructions.
Your onions, parsley, and any other cool season crops that are at least 5 weeks old can start the process of being hardened off for transplant outside. Select smaller rather than larger plants of the cole crops (broccoli, cauliflower, cabbage, Brussels sprouts) since overly mature plants exposed to low temperatures early in the season tend to bolt into flower too early.
Sow seeds outdoors for the following crops: asparagus, beets, carrots, chard, kohlrabi, leaf lettuce, mustard, onion sets, parsnips, peas, potatoes, radish, spinach, and turnip.
Establish new plantings of grapes, strawberries, raspberries, asparagus, and rhubarb as soon as the ground can be worked.
Raspberry canes that will produce this year's crop should be pruned back by 1/4 before growth resumes. Last year's fruiting canes should have been cut down to the ground after harvest last year but if not, do it now.

May

You can still start seeds indoors of Brussels sprouts, okra, pumpkin, cucumber, winter squash, melons, eggplant, pepper, and tomato. Sow vine crops in individual peat pots since these do not transplant well if roots are disturbed.
Outdoors you can sow seeds directly into the garden for beets, carrots, chard, kohlrabi, late cabbage, leaf lettuce, mustard, collards, turnips, radish, spinach, onion sets, onion seeds for bunching onions, peas, and potatoes.
Plant new trees and shrubs now.
Perform weekly exams of fruit trees and ornamental crabapples and cherries for clusters of tiny, hairy, Eastern tent caterpillars. Remove and destroy or prune out limbs where they are nesting.
Keep “hilling up” potatoes.
Begin hardening-off frost tender plants now including vegetables, herbs, perennial and annual flowers that have been started indoors.
Fertilize perennial flowers now as growth is beginning. Most will only need fertilizing every three years and only at this time of year.
If the forecast looks good, sow seeds outdoors of beans, okra, pumpkin, sweet corn, and watermelon. Plant only partial rows of beans and sweet corn so that successive plantings can be done every week or two. Sweet corn should be planted in paired rows or blocks for good pollination.
By the end of this month, it should be safe to plant almost everything outdoors -tender annual flowers like impatiens as well as tomatoes, peppers, and eggplants. Houseplants, too, can be moved to a shady spot in the yard for their summer vacations.

June

Cover Brassica crops with floating row cover to protect from cabbage moth and flea beetle damage if these little critters have been a problem in the past.
Have a trellis system in place for your tomato patch before the plants begin to sprawl.
Colorado potato beetle adults, eggs and larvae can be hand picked to remove or sprayed with an organic insecticide, spinosid if infestation is bad. Adults are yellow and black striped beetles. The eggs are yellow and laid in groups on the undersides of leaves. The larvae are humpbacked and red. Look for them on the stem tips. They are present almost all season.
Also keep an eye out for Striped and spotted cucumber beetles transmit a bacterial wilt to squashes and melons. Adults and eggs can be hand-picked throughout the season.
Watch for Mexican bean beetle. To be on the safe side you can cover the entire crop with floating row cover as soon as seedlings emerge.
Aphids of all types show up on a range of host plants as soon as the warm weather arrives. Look for them in newly unfurling foliage and sticky leaves are also a sign of their presence since they secrete a ‘honeydew’. Black sooty bold may also in this sticky substance and while alarming looking does little to no damage since it does not penetrate the leaves. Aphids, however, do damage the plant. Spray leaves with a strong jet of water to dislodge most of them. Insecticidal soap is a organic approved product that provides pretty good control as long as the insects are wetted well. A second and third treatment to kill newly hatched eggs may be needed in 5-7 days.
Squash vine borer adults are 1 inch long, orange and green day-flying moths that are emerging from the soil now. They lay brown, button-shaped, 1/16 inch eggs at the base of the vines of summer and winter squashes. Examine stems daily and remove eggs by hand to prevent burrowing of larvae as they hatch. Wrap lower 6 –12 inches of stem with aluminum foil or floating row cover to prevent egg laying.
Once the soil has warmed, put a 2 –4 inch layer of organic mulch on vegetable beds, flower beds and around trees and shrubs.

July

Start seeds indoors for your fall garden now.
Watch the leaves of your tomato plants for signs of leaf spot diseases.
Continue monitoring for pest insects talked about in the June task list.
Garden flowers, whether annuals or perennials, benefit from "deadheading" after flowering. By removing the spent flower heads, energy is used to produce more flowers or foliage and roots. Many will produce another flush of blooms.
Flowering requires lots of energy so it can be quite helpful to fertilize flowering annual plants once flowering begins. Fertilize one more time before the end of the season.
Seeds can continue to be sown throughout July for late crops of beets, bush beans, carrots, chard, Chinese cabbage, cucumbers, kohlrabi, and corn. Cover with pre-moistened potting soil mix which will not be so likely to crust and crack. To hold in the moisture, cover the rows with a very thin layer of mulch or floating row cover fabric.

August

For late crops of beets, bush beans, carrots, Chinese cabbage, cucumbers, kohlrabi, and onion sets, continue sowing seeds until August 15th. Peas and collards can be seeded again now, too.
Continue your bug removal pest damage inspections! Remove and treat as needed.
After the last raspberry harvest for the year, prepare for next year while also avoiding diseases by pruning out old flowering canes leaving only 3-4 young canes per foot of row. Wait until spring to prune back shoot tips.
Avoid pruning trees and shrubs since doing so this late in the season can stimulate new growth that will not harden off in time for the cold winter weather ahead. Delay pruning until the end of the dormant season early next spring.
Harvest onions and garlic as the tops dry and fall over. Braid garlic tops and hang in a cool, dry place. Cut onion tops back to 1" and dry thoroughly before storing. Use any damaged produce immediately.
This is a good time to order and plant spring flowering bulbs for next year's early flower display. Plan for different flowering times to extend the season.
Seeds can again be sown for a late crop of leaf lettuce, mustard greens, Swiss chard and spinach.
Continue deadheading flowers which will allow plants to use energy reserves for a final flower display.

September

Leaf lettuce, chard, spinach and radishes can still be planted for harvest this fall.
Keep up your inspecting for pests, particularly bean beetles can make a second strong showing this time of year.
Houseplants that have been "vacationing" in the backyard this summer should be brought in. Give them a good blast of water all over before bringing them in to help remove freeloading insects. Insects in the soil are probably not damaging but more of a nuisance when brought indoors. For the first couple of weeks after the move inspect your plants daily for any emergent insects and treat as needed.
Make preparations for mulching your beds for the winter. Bagged mulch is always available, but getting a truckload delivered is very economical. If you don’t think you can use a whole truckload, ask your neighbors if you can split a load.
Many fibrous rooted perennials should be transplanted every 3 -5 years as a general rule. Fall is the time to divide and transplant plants that flower in the spring while fall flowering ones like chrysanthemums should be done in the spring. Cut back tops to 4 -6" to reduce transplant stress. Thoroughly prepare the new planting site.
Pumpkins, summer squashes, and gourds to be stored should be harvested before the first frost. Pumpkins that have begun showing color will continue to ripen after harvest. Use great care not to nick the rind during harvest since this will lead to more rapid deterioration.
Keep harvesting second plantings of the cool season vegetables including radishes, lettuce, Chinese cabbage, chard, spinach, broccoli, and the other cole crops. Some such as parsnips, peas, Brussels sprouts, and kale actually have enhanced flavor after a frost.

October

Plant garlic, shallots, and perennial onions.
Drain the hoses and empty the bird baths before a hard frost.
Potted perennials can be buried in an empty part of the vegetable garden or surrounded with a thick layer of straw to get them through the winter.
Collect soil samples now for testing to prepare for next year’s fertilization of the lawn, the vegetable garden, the shrub border and flower beds. Submit separate samples for distinct areas used to grow different types of plants and where growing conditions are different for the same plants. A shady lawn area on a slope should be a different sample than a sunny lawn area.
Dig and divide spring and summer flowering perennials now. Late summer and fall flowering ones can be done in the spring. Cut foliage back, replant and water well. Wait until winter is in full-swing to add new mulch for winter protection during their first winter.
Keep an eye on the weather and harvest any remaining summer produce like beans, eggplant, peppers, and tomatoes before a hard frost rolls in.
Spread manure, rotted sawdust, rotted straw, and shredded leaves over the garden and plow them under; you'll be surprised at the difference this organic matter will make in the fertility, physical structure and water-holding capacity of the soil.
Cut and dry or freeze remaining herbs.
Remove, chop, and compost asparagus tops after they have yellowed and died for the season. Wait until the ground has frozen to mulch.

November

Empty, clean and store planters where they will be dry for the winter.
If you are using a rain barrel or two to conserve water and reduce storm water runoff, they should be emptied and turned over to keep them dry during the winter months. Reconnect your downspout to direct the snowmelt and winter rain away from your foundation.
Cole crops like Brussels sprouts, cabbage, broccoli, collards and kale are made sweeter by frost so don’t pull them out yet. Harvest them as long as possible. You can also put up a low-tunnel to extend the season.
Instead of harvesting less hardy late season crops, leave them in the garden and tuck them in with a thick layer of straw so they don’t freeze as early. This includes carrots, beets, leeks, rutabagas, turnips, winter radishes, chard, Chinese cabbage and leaf lettuce. Cover the leaf lettuce first with floating row cover fabric which breathes but will keep the straw out of your salad.
Spring flowering bulbs can still be planted as long as the ground is not frozen.
Continue to check houseplants for insects that may have come indoors as you brought the plants inside.
If your soil has frozen to at least an inch thick, now is the time to start applying a 2-4” layer of protective mulch.
Oil and store gas powered equipment like lawn mowers and leaf blowers. Repair shops are in a slow period (at least until the snow flies and snow blowers need repair) so arrange for a tune-up and blade sharpening now.

December

Consider gift memberships to local botanical gardens, arboretums or nature centers for the holidays. They are dual purpose gifts, supporting the organization while providing a thoughtful, lasting presents to your family and friends.
Protect trunks of young trees by wrapping. Surround multi-stemmed and low branching trees and shrubs with chicken wire or hardware cloth held securely against the ground. It should be tall enough to protect branches and high enough that a rabbit can’t hop over it.
Clean garden tools with a wire brush and apply a light coat of oil to protect them from rusting. Sharpen edges of hoes and spades. Clean, readjust and sharpen the blades of pruning tools. Lightly sand handles and then apply a coat of linseed oil, or paint your handles a bright color like red or orange which will make them easier to spot should you lay them in the grass.
If you haven’t already, apply a layer of much on all of your planting beds, especially around your perennials.
A thick layer of straw over root crops like potatoes, parsnips, and carrots as well as parsley and leeks will protect them long enough to harvest them a little at a time well into the winter.
Avoid rock salt, which is sodium chloride, to melt sidewalk and driveway ice. Products made of calcium chloride or potassium chloride cause less damage to plants. For traction, sprinkle sand, kitty litter, or wood ashes sparingly. Mix with a little melting compound if more than just traction is needed. Minimize de-icing and traction products to reduce pollution in storm sewers and streams.

	*Article Written by:Angie Lavezzo*
	About the Author:Angie Lavezzo is the former general manager of Sow True Seed. Beyond her professional role at Sow True, Angie's passion for gardening extends into personal hands-on experience, fostering plants and reaping bountiful harvests.