Convulvus tricolor This great dwarf variety morning glory grows to only a foot or two high, making it ideal for limited space or in conditions where growth control is desired. Regular morning glories can have such overwhelming growth that constant trimming is required to keep them from shading out your other plants, not so with these great little beauties! Sow seeds indoors several weeks before the last frost. Soak overnight in warm water. Plant 1/8 inch deep in moist soil. Transplant outdoors after the last frost and water well. These plants thrive in warm, moist conditions and will produce beautiful flowers. These plants are perennials in warm climates, and will function as annuals in colder places.