Detailed Guide to Planting Methods and Timing for Roselle

The soil for planting roselle is best as sandy loam with deep soil layers, loose and fertile, acidic to slightly acidic. Generally sow from late April to early and mid-May; soak the seeds for 12 hours before sowing, then cover with 0.5-1 cm of soil after sowing. Water promptly during drought, drain promptly during the rainy season, apply supplemental fertilizer in good time, weed and loosen the soil frequently, and control pests and diseases promptly.

1. Soil: Roselle is not strict about soil requirements, but sandy loam with deep soil layers, loose and fertile, acidic to slightly acidic is best; it should not be planted in low-lying, damp land, clay soil, or alkaline soil.

2. Sowing: Generally sow from late April to early and mid-May. Soak the seeds for 12 hours before sowing, choose a sunny day after rain for sowing, use the method of hole sowing, sow 4-5 seeds per hole, with a sowing depth of 3 cm, then cover with 0.5-1 cm of soil after sowing.

3. Water and fertilizer: Roselle likes moisture and dislikes waterlogging; it does not need too much water during the growing period, so water promptly during drought and drain promptly during the rainy season. Roselle is tolerant of fertilizer; in addition to applying sufficient base fertilizer, supplemental fertilizer should also be applied in good time. During the seedling stage, nitrogen fertilizer is mainly used, and from budding to the stage when the calyx and fruit enlarge, phosphorus and potassium fertilizers are mainly used.

4. Management: When the seedlings are about 15 cm tall, thin them out, removing weak and diseased seedlings, keeping 1 strong seedling per hole, and pulling out the rest to fill gaps; when the seedlings are 80 cm tall, pinch off the tips to encourage strong branches and more flowers. During the growing season, weed and loosen the soil frequently, and control pests and diseases promptly.