Plants whether grown in greenhouse or in windows, will require increased ventilation and water this month, and as they will now be growing rapidly, due attention must be paid to shifting into larger pots when necessary, and also increase the space if possible by putting the hardier sorts out in frames. If plants are crowded at this season in the greenhouse, they will grow spindling and weak. It is better to throw away the common or coarser plants if there is not room for the finer sorts to develop properly. Towards the end of the month it may be necessary to partially shade the glass of the greenhouse; this may be either done by sheeting hung on rollers from the top, or more simply and cheaply by making a very thin whitewash of lime; this may be spattered over the glass very lightly at first, just to mark the glass with white spots as thick as if a slight shower should leave the marks of its drops. The wash is to be spattered on thicker every week or two, as the season advances. The planting of all kinds of hardy herbaceous plants and shrubs may now be done in the flower-garden. Bulbs and all tender plants that have been covered for protection in winter may now be stripped, and the beds slightly forked and raked. Sow tender annual flower seeds in boxes.
Strawberries that have been covered up by straw or leaves, should now be relieved around the plant, only leaving the covering between the plants; see chapter on Strawberries. Raspberries, grape-vines, etc., that have been laid down may now be uncovered and tied up to stakes or trellises, and all new plantations of these and other fruits should now be made.
The covering of asparagus, rhubarb, spinach, etc., should now be removed, and the beds hoed or dug lightly. The hardier sorts of vegetable seeds and plants, such as beets, cabbage, cauliflower, celery, lettuce, onions, parsley, parsnip, peas, potatoes, radishes, spinach, turnip, etc., should all be sown or planted by the middle of the month, if the soil is dry and warm, and in all cases where practicable before the end of the month, for if these varieties of vegetables are delayed until the hot weather in May, they will not be so early, and in most cases will not produce so fine a crop. It is quite a common practice with many amateurs to delay garden operations of all kinds until May, but all the hardier sorts of vegetables are likely to be later and inferior in consequence. Any one expecting to get early cabbage, lettuce, or radishes, if planting or sowing is delayed until the time of planting tomato and egg plants in May, is certain to be disappointed.