Rocket produces harvestable leaves in three weeks and grows in containers, raised beds, or polytunnels year-round. Multiple varieties suit different seasons, from tender summer types to hardy winter cultivars. Sow successively for continuous crops and harvest outer leaves when they reach usable size.
Rocket is one of the easiest and most rewarding crops for UK gardeners. Whether you're a complete beginner or seasoned grower, this peppery leaf delivers harvests in as little as three weeks from sowing. It thrives in containers on a windowsill, in raised beds, or under polytunnel protection through winter.
With multiple varieties suited to different seasons—from tender summer types to hardy winter cultivars—you can enjoy fresh rocket almost year-round. This guide covers everything you need to know about sowing, growing and harvesting this versatile salad leaf.
Choosing the Right Variety
Rocket Wild offers intense peppery flavour and fine foliage, ideal for salads and garnishes. Rocket Sweet Oakleaf delivers milder, tender leaves perfect for younger palates and mixed leaf salads. Winter Rocket is your hardiest choice, withstanding frost and cold frames through December to February in most UK regions. All Season Rocket provides reliable cropping spring through autumn with moderate flavour. For the most intense taste and fastest growth, Wild Rocket is unbeatable, though it bolts quickly in summer heat. Match your variety to your season: tender types for spring and early summer, winter varieties for autumn and late winter harvests.
When to Sow and Plant Out
Sow rocket directly outdoors from March through September in southern UK, February through October in milder coastal areas. For continuous supply, succession sow every two weeks. Indoor sowing on a warm windowsill works February onwards; transplant seedlings outdoors after last frost (mid-May in northern regions, late April in the south). Winter Rocket can be sown July to August for autumn and winter harvests. Avoid June and July outdoor sowing in hot years—heat triggers bolting. Under polytunnel or cold frame, extend the season October through March using Winter Rocket or All Season Rocket for reliable winter picking.
Soil, Site and Containers
Rocket tolerates most soils but prefers well-draining, fertile ground with pH 6.0–7.0. Amend poor soil with compost or well-rotted manure before sowing. Full sun (six hours minimum) suits spring and autumn growth; in summer, afternoon shade reduces bolting. Containers are ideal: sow directly into 15 cm pots or modules filled with multipurpose compost, or broadcast seed across a shallow tray. Ensure drainage holes prevent waterlogging. Rocket's shallow roots mean containers dry quickly, so check moisture daily in warm weather. A sunny windowsill, balcony, or sheltered border works equally well indoors or out.
Feeding, Watering and Care
Water consistently to keep soil moist but not waterlogged—rocket bolts prematurely if stressed by drought. In containers, daily watering is often needed during growth. Thin seedlings to 10 cm spacing once true leaves appear; thinnings are edible. Rocket needs little feeding if sown into compost or amended soil; excess nitrogen encourages bolting. If growth slows after six weeks, apply a balanced liquid feed (NPK 7-7-7) fortnightly. Remove any flower buds to extend leaf harvest. Protect young seedlings from wind with fleece or netting to prevent physical damage and pest pressure.
Common Problems and Solutions
Flea beetles are the main pest: tiny, shiny insects that pepper leaves with shot-hole damage. Protect seedlings with fine mesh or fleece until plants establish. Downy mildew appears as white fungal coating on leaf undersides in cool, damp conditions—improve air circulation and avoid overhead watering. Slugs damage seedlings; use beer traps or copper tape around containers. Bolting (flowering prematurely) is triggered by heat, drought, or overcrowding; succession sow for younger plants and provide afternoon shade in summer. Powdery mildew is rare but appears as white dust; spray with sulphur if needed. Most problems are prevented by good spacing, consistent moisture and timely harvesting.
Harvesting and Storage
Begin harvesting when leaves reach 5–8 cm, typically three to four weeks after sowing. Pinch outer leaves regularly to encourage bushy growth and delay bolting. Whole plants can be cut at soil level once established. Morning harvest yields crispest leaves. Rocket is best eaten fresh but keeps three to five days in a sealed container in the fridge. Wash and dry thoroughly before storage to prevent rot. Younger Wild Rocket leaves are most tender; older leaves become coarser but remain flavourful. Succession sowing ensures continuous supply rather than relying on long-term storage.
Frequently asked questions
Can I grow rocket indoors year-round?
Yes. Sow in containers on a bright windowsill (minimum four hours direct sun). Growth slows in winter but Winter Rocket and All Season Rocket will crop slowly under grow lights or south-facing glass. Rotate containers weekly for even growth.
Why does my rocket bolt so quickly?
Heat, drought and overcrowding trigger bolting. Sow in spring or late summer instead of peak summer. Thin seedlings properly, water consistently, and provide afternoon shade. Harvest regularly to delay flowering.
How often should I water rocket?
Keep soil consistently moist but not waterlogged. In containers during warm weather, check daily—soil may dry within hours. Outdoors, water two to three times weekly unless rain falls. Underwatering causes bolting; overwatering risks mildew.
Is rocket frost-hardy?
Winter Rocket survives frost and continues cropping through December in most UK regions. Other varieties are tender and stop growing below 5°C. Use cold frames or polytunnels to extend the season for non-hardy types.
What's the best variety for a beginner?
All Season Rocket is most forgiving: reliable, moderately flavoured, and tolerant of variable conditions. Wild Rocket offers superior taste but bolts faster. Try both to find your preference.