Basil Spicy Globe,' dwarf sage, winter savory, parsley, chives, and varieties of oregano and thyme are some of the best for windowsill culture. When given proper care in a sunny window, they will supply sprigs for culinary use through all seasons. Although many herbs are considered drought-tolerant, some moisture is needed to maintain active growth. For a continual supply of fresh-cut herbs, periodic irrigation during dry periods is needed. As with all plants, a thorough watering with a period of drying is preferred over frequent sprinkling.
Annual herbs require a higher level of available soil moisture than most perennial herbs.
Proper nutrient balance is very important. Weak, succulent growth can be caused by over-fertilization, making the plant susceptible to disease and insect pests. Rapid growth also dilutes the concentration of essential oils that impart the distinctive flavor to the culinary herb. Inadequate fertilizer can severely limit new growth, predisposes the plant to insect and disease problems, and increases the susceptibility of tender perennials to winter injury. A light application of fertilizer to perennials in early spring should promote new root and shoot growth and ensure vigor in the new growing season.