Growing rocket: sowing, watering and harvesting leaves

Cultivated rocket or wild rocket?

This factsheet covers annual cultivated rocket, Eruca sativa, also known as Eruca vesicaria subsp. sativa. Perennial wild rocket sold under the name Diplotaxis tenuifolia lives for several years and is managed differently: do not apply the same cycle to both. SNHF · RHS

When to sow rocket?

In France, the SNHF recommends sowing from April to August, then September to October for a spring harvest. However, it advises against sowing during the hot, dry peak of summer, which accelerates bolting. These sowing windows do not guarantee seedling emergence or successful overwintering in every region: check the variety and garden conditions. SNHF

Make small successive sowings rather than a single long row; the annual’s harvest period is limited. In hot weather, choose light shade to extend leaf production. RHS

The calendars for April and September help plan available rows.

How to sow and thin?

Sow directly in soil that remains moist. The SNHF specifies 1 cm depth and 20 cm between rows. After a few leaves appear, remove the weakest seedlings to leave 5 to 10 cm between the remaining plants. Adjust these guidelines based on the seed packet and the space needed for harvesting. SNHF

Label the date and botanical name: this will help distinguish trials of annual and perennial rocket. Find seedbed preparation in the sowing guide.

How to water and feed rocket?

Water after sowing, then as needed to keep the soil moist. Weed around the row. These practices delay bolting but do not prevent it indefinitely. SNHF

In light soil that dries quickly, well-rotted garden compost incorporated before sowing can help retain moisture. The RHS recommends fertile soil for cultivated rocket; it distinguishes wild rocket, which tolerates poorer, drier soil. This does not imply automatic fertiliser use. RHS

Why does my rocket bolt so quickly?

The annual naturally completes its cycle with flowering, accelerated by heat and drought. Maintaining moisture and choosing partial shade in summer may extend the harvest; cutting flower stems offers only temporary relief. Prepare a new small sowing to replace the exhausted row. RHS

How to harvest for multiple pickings?

Pick a few leaves from several plants, without stripping a single one. The RHS describes several possible harvests before flowering; their duration depends on the season. The SNHF mentions a harvest start at around six weeks under good conditions. RHS · SNHF

Can it be grown in pots and harvested in winter?

A well-drained pot is suitable; the RHS advises at least 30 cm width to limit drying out. For autumn sowings, the SNHF notes winter harvests only if the late season remains mild. Protection may extend cultivation but does not guarantee continuous production. RHS · SNHF

Small holes in the leaves: is it a disease?

Flea beetles may nibble rocket; slugs and snails are also possible. Observe the culprits before concluding: holes alone do not prove disease or the need for treatment. RHS

To compare signs of flea beetles, caterpillars and other pests by crop, consult the pest guide for brassicas and related vegetables. It distinguishes leaf examination from root inspection; use only the guidelines explicitly applicable to rocket.