Cucumber plants have shallow roots and require ample soil moisture at all stages of growth. When fruit begins setting and maturing, adequate moisture becomes especially critical. For best yields, incorporate compost or well-rotted manure before planting. Cucumbers respond to mulching with soil-warming plastic in early spring or organic materials in summer. Use of black plastic mulch warms the soil in the early season and can give significantly earlier yields, especially if combined with floating row covers.
Side-dress with nitrogen fertilizer when the plants begin to vine. Cucumber beetles should be controlled from the time that the young seedlings emerge from the soil.
In small gardens, the vines may be trained on a trellis or fence. When the long, burpless varieties are supported, the cucumbers hang free and develop straight fruits. Winds whipping the plants can make vertical training impractical. Wire cages also can be used for supporting the plants. Do not handle, harvest or work with the plants when they are wet.
Pick cucumbers at any stage of development before the seeds become hard. Cucumbers usually are eaten when immature. The best size depends upon the use and variety. They may be picked when they are no more than 2 inches long for pickles, 4 to 6 inches long for dills and 6 to 8 inches long for slicing varieties. A cucumber is of highest quality when it is uniformly green, firm and crisp. The large, burpless cucumbers should be 1 to 1 1/2 inches in diameter and up to 10 inches long. Some varieties can grow considerably larger. Do not allow cucumbers to turn yellow. Remove from the vine any missed fruits nearing ripeness so that the young fruits continue to develop. The cucumber fruit grows rapidly to harvest size and should be picked at least every other day.
Selection & Storage
There are two types of cucumbers common to the home gardener - pickling cucumbers and slicing cucumbers. The phrase "cool as a cucumber" is an apt one. Growing in a field on a hot summer day, the interior flesh is 20 degrees cooler than the outside air temperature.
Harvest cucumbers early in the morning (before have been heated by the afternoon sun) and refrigerate immediately. Store for up to 3 days in the refrigerator in loose or perforated plastic bags. Supermarket cucumbers are covered with an edible wax to protect them from moisture loss. The wax gives them an unnatural sheen. Fresh cucumbers are dull green in color.
Pickling cucumbers — Pickling cucumbers should be picked every day, since they can quickly grow too large for use. Do not leave over-mature, yellow cucumbers on the vine. If a single cucumber is left on the vine, the vine will stop producing altogether.
Slicing cucumbers — Slicing cucumbers should be harvested as needed. But there is no practical use for baseball bat size cucumbers. They are tough and the seeds are woody. Harvest when they are 8 inches long or smaller. As with pickling cucumbers, remove the over mature ones as soon as you see them or they will halt the growth of new cucumbers.