Rocket (_Hesperis_).--The hardy perennials like a light, rich soil,
and need to be frequently divided. The best time to divide them is
just after they have done flowering, when they should be potted off,
planting them out again in the spring. The annual and biennial kinds
merely require to be sown in the open border. Most of the Rockets give
forth greater fragrance towards evening. Their flowering season is
June. Height, 1 ft. to 1-1/2 ft.