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The single most useful thing to understand about growing endive is that it must grow without interruption from germination to harvest. It is a shallow-rooted plant carrying a lot of leaf, and a week of dry soil in the middle of the season produces a rosette that stays small, turns leathery, and tastes far more bitter than it should even after blanching. Growth that stops does not simply resume where it left off.
Water when the top inch (2.5 cm) of soil is dry, and water deeply enough to wet the top six inches (15 cm) rather than sprinkling the surface daily. In warm weather on light soil that will mean a thorough soak every three or four days; in cool autumn weather it may be once a fortnight. Judge by the soil, not by the calendar.
Water at the base with the spout held low. Overhead watering is the second great enemy of endive: it fills the dense center with water that sits there for hours, and that is where rot and slugs both begin. Once the plants are close to full size, watering in the morning gives the foliage the whole day to dry.
Feeding, and knowing when to stop
Endive needs less feeding than its size suggests, provided the bed had compost worked in before sowing. One liquid feed leaning towards nitrogen at about four weeks after sowing, when the plant has six or seven true leaves, carries it through the phase where it is building leaf area. A second feed three weeks later is worth giving only on poor, thin soil.
Stop feeding entirely once the innermost leaves start curving in over each other. From that point the plant is filling a heart rather than making new leaves, and extra nitrogen produces soft, sappy growth that collapses under a blanching cover and attracts aphids. A firm, slightly hard-grown plant blanches cleanly; a lush one rots.
Yellowing on the oldest outer leaves late in the season is normal and not a sign of hunger. Yellowing on the newest leaves in the center while the plant is still growing means something else is wrong, usually waterlogged ground or a root damaged by cultivation too close to the crown.
| Stage | Water | Feed | Main job |
|---|---|---|---|
| Seedling to third true leaf | Keep surface just damp, little and often | None | Thinning to final spacing |
| Fourth leaf to half size | Deep soak every 3 to 4 days in warmth | One nitrogen-leaning liquid feed | Mulching and weeding |
| Half size to full rosette | Deep soak as the soil dries, at the base only | None on good soil | Keeping the crown clear and dry |
| Heart closing and blanching | Reduce sharply, never overhead | None | Slug patrol and blanching |
Space, air and a clean crown
Endive that touches its neighbors holds damp air between the plants all day, and damp air around a dense rosette in autumn is how bottom rot starts. Hold the final spacing you set at thinning even when the young plants look lost in the bed: 10 to 12 inches (25 to 30 cm) for curly kinds, 12 to 14 inches (30 to 35 cm) for broad-leaved ones, with 14 to 16 inches (35 to 40 cm) between rows.
Every couple of weeks go along the row and pull off any outer leaf that is yellowing, torn or lying flat on the soil. Those leaves contribute nothing, they keep the soil beneath them wet, and they are the first thing to start decaying. Clearing them lifts the whole rosette clear of the ground and lets air under it.
Mulch with an inch (2.5 cm) of compost between the plants but keep it pulled back an inch (2.5 cm) from the crown itself. Mulch piled against the stem holds moisture exactly where you do not want it. Weed by hand close to the plants rather than hoeing, since a hoe run in close will sever the shallow feeding roots and cause the very check you are trying to avoid.
If your ground is heavy or lies wet in autumn, grow endive on a ridge or a raised bed four inches (10 cm) proud of the path. Getting the crown above standing water does more for the crop than any other single change.
Cold, shade and the last stretch
Endive is a cool-weather plant and it improves as the weather turns. Light frost sweetens it. In the last weeks of an unusually warm autumn a light shade over the bed during the hottest part of the day keeps the leaves from going tough and stops the plant thinking about flowering.
As nights begin dropping below 28F (minus 2C), throw a light row cover over the bed in the evening and take it off in the morning. That is usually enough to keep the outer leaves undamaged, which matters because damaged outer leaves are what you would otherwise be tying up over the heart. Broad-leaved kinds take considerably more cold than curly ones.
Keep working through the bed even once you have started blanching. Plants still growing on need the same watering and the same removal of dead outer leaves as before, and it is easy to neglect the uncovered half of a bed while attending to the covered half.
The record that makes next season easier
Note the date of each feed, the date you stopped feeding, and the date the hearts began to close. Add a line whenever you water heavily, and a line whenever you find rot at a crown. Those entries together explain most of what a bed of endive does over a season.
The pairing worth watching is the gap between the last feed and the first sign of soft rot. If rot keeps appearing within two weeks of a late feed, the feeding is too late rather than the weather being too wet, and that is a change you can make immediately next year. Record the plant positions too, so you know which end of the bed suffers, since drainage differences across even a short row show up clearly over two seasons.