A tall, striking tropical annual grown for its fleshy, cranberry-tart calyces (the cup-shaped structures that enclose each flower) used in teas, jams, and syrups.
Hibiscus sabdariffa · also called sorrel, Jamaica sorrel
Windows are counted from the average date of your last spring frost.
Roselle produces abundantly in hot summers where many crops struggle, and the calyces are among the richest plant sources of anthocyanins (the pigments responsible for deep red color and antioxidant activity). Young leaves are also edible as a cooked green.
A little history. Native to West Africa and widely naturalized across tropical Asia and the Americas. A short-day plant — flowering is triggered when day length drops below roughly 12.5 hours, so harvest typically falls in autumn regardless of sow date.
Sow seeds ½ inch (13 mm) deep, and aim for 24 inches (60 cm) between plants once thinned. Sow 0.5 inches deep; keep the seedbed evenly moist until sprouts appear — seeds rot if waterlogged but stall if the surface dries out. Seedlings emerge in 7–14 days.
Beds strongly preferred — plants reach 4–6 feet tall and need 12–18 inches of root depth; containers restrict yield significantly. In containers: 15-gallon pot minimum, 18-gallon preferred.
Deep soak once or twice a week; reduce slightly once plants are established and flowering. Water when the top 2 inches of soil feel dry or leaves show slight midday droop. Aim for about 1–1.5 inches per week including rain.
Side-dress (scatter fertilizer along the row and water in) at planting, then again at 6 weeks. What to use: balanced 5–5-5 organic or compost at planting; switch to a lower-nitrogen feed once flowering begins.
Pinch the growing tip once plants reach 12 inches to encourage branching and more flowering sites; remove no more than the top 2–3 inches.
It's ready when calyces are ready 2–3 weeks after petals drop — harvest when the calyx is plump, firm, deep red, and snaps cleanly; soft or shriveled calyces are past peak. Use scissors or a sharp knife to cut the calyx with its seed capsule just below the fleshy base; separate the calyx from the hard inner seed pod before use or drying.
Fresh calyces keep 1–2 weeks refrigerated in a breathable bag; dry at 95–110 °F (35–43 °C) until brittle and store in an airtight container for up to 1 year.
Succession sowing is not practical — flowering is controlled by day length, so all plants in a season converge on the same harvest window regardless of sow date.
Basil
Basil's strong-scented foliage can help hide young roselle from aphids and whiteflies that locate hosts by smell. Effects are modest and show up best under low pest pressure, so treat it as a bonus rather than a substitute for scouting.
French Marigold
French marigold flowers draw in hoverflies and tiny parasitic wasps that hunt aphids on roselle's new growth. For the separate root-knot nematode benefit you would need a thick block turned into the soil at season's end, not a few edge plants.
Sweet Potato
Sweet potato vines run flat across the ground beneath roselle's tall, open frame, shading the soil, holding moisture through hot weeks, and crowding out weeds that would otherwise need hand-pulling around the stems.
Cowpea
Cowpea banks nitrogen in its roots, and most of that becomes available for the NEXT season once the roots break down in the bed. It also thrives in the same heat, so it holds ground beside roselle without sulking.
Okra
Okra is a close mallow-family relative and shares roselle's leaf spot troubles along with whiteflies and aphids. Planting them side by side stacks the risk and makes the family gap in your rotation harder to keep.
Easy-going — Roselle can grow almost anywhere in the rotation without a strict rest.
The pea and bean family, the cabbage family or the tomato family thrive in this ground next season.
Roselle is a light feeder that leaves behind coarse, woody stems rather than fertility — chop the tops for the compost pile and pull the root ball. Wait 1 year before another mallow-family crop returns to the bed. Legumes, brassicas, or nightshades all follow well here.
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