Rocket: plant running up to flower before it is ready to eat

What it is likely to be on rocket

1. Bolting

   Candidate 1very common on this plant

   ·source

   Sourced guidancehigh confidence

   • Royal Horticultural Society: Bolting

   Checked 2026-08-13

   A plant switching from leaf or root production to flowering and seed. It is the plant doing exactly what it evolved to do under stress, and it cannot be reversed — which makes bolting a problem of timing and cultivar choice rather than of treatment.

   Points towards it

   • · heat is the usual trigger, and lettuce responds to it within days
   • · a check from drying out brings it on as reliably as heat does
   • · a growing-season problem

   Argues against it

   • · a recent repot points to transplant check rather than to the plant deciding to flower

   Check this next

   Look at the centre of the plant. A lettuce running a stem up from the middle, or an onion sending up a thick round flower stalk, has bolted — and no amount of watering reverses it once the stem has started.

   What to do now

   Harvest what is usable now rather than waiting: a bolted lettuce turns bitter within days, and a bolted onion will not store. Sow successionally and keep the crop evenly watered to reduce it next time — bolting is a response to a check, not a disease.

   ·source

   Sourced guidancehigh confidence

   • Royal Horticultural Society: Bolting

   Checked 2026-08-13

2. Underwatering

   Candidate 2common on this plant

   ·source

   Sourced guidancehigh confidence

   • Royal Horticultural Society: Rocket — cultivation
   • Royal Horticultural Society: Watering vegetables

   Checked 2026-08-13

   Easier to correct than overwatering and easily confused with it, because a plant short of water and a plant drowning both wilt. The distinguishing observation is not the plant at all — it is the compost, and it takes two seconds to check.

   Points towards it

   • · a check to a fast crop from dry soil is read by the plant as the end of its season, and it flowers rather than growing on
   • · the dry end of a row or the stretch under a fence bolts first while the rest carries on, which is what separates it from a whole-row response to weather
   • · the stem emerges from the centre while the outer leaves stay small and tough
   • · a bed under cover dries fastest of all and rocket grown in a tunnel bolts at half the size for exactly this reason

   Argues against it

   • · a plant that has never been short of water did not bolt from drought — this rules it out entirely.
   • · cool damp weather is when these two grow best and bolt least

   Check this next

   Measure the plant rather than reading the calendar. A radish or rocket that bolts from drought does it while it is half-sized — a rocket flowering at 10cm with small tough peppery leaves, a radish with a pencil-thin woody root — and it does it unevenly along the row, worst where the soil dries first. A plant that reached full size and then ran is responding to warmth and daylength instead. Push a finger to 5cm at the bolted end and at the sound end and compare; the difference is usually obvious.

   What to do now

   Water little and often rather than heavily and occasionally, which is the correct advice for shallow-rooted fast crops and the opposite of the advice for potatoes: keep the top 10cm consistently damp through the whole three to six weeks. Mulch lightly between the rows, sow into ground that has been watered rather than watering after sowing, and give a tunnel bed the same attention as an outdoor one — under cover it dries faster and gets forgotten. Pick rocket hard and often; a cut plant runs later than an uncut one.

   ·source

   Sourced guidancehigh confidence

   • Royal Horticultural Society: Watering — how much and how often
   • Garden Organic — Garden Organic (Henry Doubleday Research Association): Salad crops under cover

   Checked 2026-08-13

Narrow it down

This page lists everything at once, which is the right shape for reading and the wrong shape for deciding. The interactive tool asks one question at a time, starting with whichever would separate these causes fastest, and stops as soon as further answers would not help.

Opens with the plant and the symptom already set. Nothing you answer is stored or sent anywhere — the answers live in the address bar and nowhere else.

What this does not cover

These are the causes GrowingHQ holds rules for on rocket — not every cause there is. Where several problems look alike, the honest answer is often that they cannot be told apart by eye, and a page that named one would be guessing. If none of the above fits, the general plant running up to flower before it is ready to eat page lists causes across all plants, and the Rocket profile lists the problems it is prone to.