Water Dropwort Through the Year: Season by Season Jobs

The shape of the year

This plant's year is driven by temperature rather than day length. It grows fast and tastes clean between about 50 and 70F (10 to 21C), which makes spring and autumn its two proper seasons. Through heat above roughly 80F (27C) it lengthens, hollows, turns harsh and throws flat white flower heads. Through cold it slows almost to a stop but survives as roots and crowns, and in mild regions it keeps producing pickable leaf all winter.

So the plan is not one sowing and one harvest. It is a spring establishment and a hard cutting rota, a defensive summer of shade and cold water where you cut little, a strong autumn run that is often the best eating of the year, and light winter picking with a renewal of the clump built into the following spring.

Spring: renew, mulch and get the rota going

As soon as the crowns show signs of moving, go over the bed while the growth is still short. Pull out anything you did not plant, check the labeling, and cut back the previous year's tired stems to 2 inches (5 cm). Then spread an inch (2 to 3 cm) of well rotted compost over the wet surface, which feeds the plant and gives the new stolons something to root into, and bring the water back up to normal depth.

Every second or third spring, renew the clump rather than just feeding it. The center goes woody and stops producing while the young rooted tufts around the edge do all the work. Lift and discard the old crowns, replant four or five young rooted stolon tufts into fresh compost, flood, and give them six weeks before the first cut. New plantings and freshly rooted cuttings follow the same rule: no cutting for six to eight weeks.

1. Clear and inspect while the growth is short This is the one time of year you can see the whole surface. Remove every plant you did not put there and confirm the boundary and the label.
2. Cut back last year's growth to 2 inches (5 cm) Shear off the tired winter stems so the new flush comes away evenly rather than through a mat of old material.
3. Mulch with compost and refill the water An inch of well rotted compost over the surface, then bring the standing water back to 1 to 2 inches (3 to 5 cm).
4. Start the cutting rota once shoots reach 8 inches (20 cm) Divide the patch into two or three blocks and shear them a fortnight apart so a block is always ready.

Summer: the defensive season

Heat is what beats this crop, and it does not fail gracefully. Stems lengthen and hollow, the leaflets narrow, the flavor goes from aromatic to harsh, and mature clumps send up branching flat heads of small white flowers. None of that is a mistake in your care and no amount of feeding reverses it. What you can do is slow it down.

Shade the bed or the tray through the hottest part of the afternoon. Keep the standing water deeper than usual, since a deeper body of water heats more slowly, and refill in the evening with cold water to drop the root temperature overnight. Through hot spells, empty and refill rather than topping up, because water standing warm for weeks goes sour and rots the lower stems. Cut flowering stems out at the base as they appear, cut only what you actually need, and let quality come back when the nights cool.

Do not try to nurse a clump that has flowered right through and gone woody. Young rooted stolon tufts taken from the edge will out-produce it within a month of the weather cooling.

Autumn: usually the best eating of the year

As soon as the peak heat breaks, growth restarts and the flavor cleans up. Autumn leaf is typically broader, darker and more tender than spring leaf, with less pest pressure and softer light. Move any shade off the bed or tray and return it to full sun, because autumn light is weak and the plant wants all of it, and go back to the three to four week shearing rota.

Feed at half strength after each cut until growth visibly slows, then stop. Plants that go into cold weather carrying a lot of soft, heavily fed growth suffer more from frost than slightly harder ones do. Autumn is also the easiest time to increase your stock: cut stolons into two or three node lengths, peg them onto the wet surface of a second pot, and they root within a fortnight while the ground is still warm.

1. Take the shade off and return to full sun What saved the crop through the heat now limits it. Autumn light is weak and every hour of it counts.
2. Resume the full cutting rota Regrowth is still quick early in the season and stretches out as the nights cool. Shear blocks a fortnight apart and expect intervals to lengthen.
3. Root cuttings for next season Two or three node lengths of stolon pegged flat on wet compost, tray kept full. They root before the cold arrives and overwinter as small plants.
4. Stop feeding as growth slows Soft late growth is the part that turns to mush in the first hard frost. Let the plant firm up before winter.

Winter: light cropping and the notes that pay off

The crowns and roots are hardy well into cold winters. In mild regions the plant keeps producing slowly all winter and you can go on picking small quantities right through, which is one of the best things about this crop. In colder regions it dies back to the crown and restarts in spring, and a pot brought into a cool bright room with its tray kept full will crop slowly indoors instead. Outdoors, reduce the standing water to a shallow film so the crowns are not frozen into a solid block, stop feeding, and shelter the bed or tray from drying wind.

Pick lightly and never shear a whole block in cold weather. Regrowth is slow and a hard cut can leave the crown exposed for months. Winter is the moment to read back through the season's notes, and five entries are worth having: the source and planting date, the date stolons first ran, the date of each cut with how many days regrowth took, the day the flavor first turned harsh, and the day the first flower head appeared. Those last two set your shading deadline for next summer, and the regrowth intervals tell you exactly how many blocks you need to crop continuously.