Early in the month, depending on conditions, harden off (to place outdoors for short periods of time each day, and increasing this time each day as well) transplants of cool-weather crops such as cabbage, broccoli, Brussels sprouts and cauliflower for planting into the garden by mid to late-month. Keep plant covers handy to guard against killing frosts. Sow Endive, Kohlrabi, Lettuce, Onion Sets, Parsley, Peas, Radishes, Spinach, and Turnips as soon as ground can be worked.In early April, sow more peas, spinach, turnips, lettuce, radishes, carrots, parsnips, and beets. Set out and plant potatoes and onion sets. In mid to late April, make succession planting of these crops. Asparagus and rhubarb bed can be planted at this time.
Your established asparagus bed should be into full production by the end of April. Beds more than 2 years old can be picked daily by snapping off 6 to 8 inch spears.
Gradually remove winter mulches from roses. Prune to remove winter-killed wood and give them their first feeding. Plant new roses this month but do not feed until you see 1-2 inches of new growth.Also remove mulch from perennials. Side-dress peonies and delphiniums with compost and bone meal.
Remember the general rule about transplanting perennials; dig those that flower in the summer in the spring; and those that flower in the spring in the fall.
Plant new fruit trees, bushes and vines as soon as the soil can be worked. Do not fertilize them this year though; the good rich top soil-peat combination you planted them in will be all they need.
Treat bark cracks, caused by winter weather, with tree wound dressing. Prevent this injury next year by painting trunks and large branches with white latex paint in the fall, or by wrapping trees with brown tree wrap.
Spray Paper Birches now to kill leaf miners; and Crabs with a multi-purpose fungicide to control leaf spots and scab; be sure to spray around the base of the tree out to the drip line.
Crabicides can still be applied in this month. The way the crabicides work is that they kill the seed just after it germinates. The seeds of last year are the ones you will be going after now.
If the month has been warm, sowing grass seed can be done now. Keep spring lawns mowed at 2 inches.
There are many more things to do in this month; go to my Web site and click on the “YouTube Enhanced Garden Articles” and you will see the article: WHAT TO DO IN APRIL