Vietnamese Culantro 650 Seeds

Start sowing Culantro seeds 1/4 inch deep in moist, well-draining seed-starting mix, and maintain soil temperatures between 65–75°F. Don't let the surface dry out — inconsistent moisture is the main reason Culantro seed fails to sprout. Start indoors 8–10 weeks before your last frost date for the earliest outdoor transplants, or sow directly outdoors once nighttime temps stay above 60°F consistently.

This Culantro plant does better in partial shade than in hot, exposed afternoon sun. Extra heat pushes it toward flowering, and once that happens, leaf production slows down. Keep soil temperatures around 60–70°F for active growth, though the plant can handle a wider range from 40–80°F. Use loose soil that holds moisture without staying soggy. This is not a heat or drought tolerant plant, so keep watering it consistently. Space plants 8–12 inches apart so air can move and the rosettes have room to fill out. 

Harvest outer Culantro leaves regularly to keep the plant productive. Removing outer leaves redirects energy away from the flower stalk and delays bolting. The moment you see a central spike forming, cut it immediately; sometimes this buys another few weeks of leaf production. Feed monthly with a balanced fertilizer, or work compost into the soil at planting — Culantro herb responds well to fertility, producing larger, more flavorful leaves. In zones 10–11, plants can overwinter and regrow from the base; everywhere else, save seed from the flower spike before pulling the plant at season's end.