When to plant
Start indoors 8–10 weeks before last frost. Transplant after all frost risk has passed. Tender perennial (zones 9–11); grown as annual in colder zones. In zones 8+, cut back in fall and mulch heavily — may return from the roots in spring. Very easy to overwinter as a houseplant in a sunny window.
Soil & site
Well-drained, moderately fertile soil. pH 6.5–7.5 (near-neutral). Add compost and ensure excellent drainage — stevia does not tolerate wet roots. Full sun is essential for maximum sweetness. Sandy loam is ideal.
Feeding
Light feeder. Apply balanced fertilizer at planting. A second light application at midsummer is helpful. Avoid heavy nitrogen, which produces leafy growth but can dilute the sweetness.
Common problems
Root rot in poorly drained soil (the main failure). Aphids and spider mites. Fusarium wilt in some regions. Very sensitive to frost — bring indoors or take cuttings before first frost. Stevia is a tropical plant that dies at 32 degrees F.
When to harvest
Leaves are sweetest just before flowering. Harvest when the plant is well established (12–18 inches tall) and bushy. As soon as flower buds begin to form at branch tips, the sweetness in the leaves declines rapidly — harvest or pinch buds immediately. Morning harvest after dew dries yields the most flavorful leaves.
How to harvest
Pinch off stem tips, cutting just above a lower leaf pair — this encourages bushy growth and more leaf production. Do a full harvest (cutting the plant to 6 inches) once or twice during the growing season. Dry leaves immediately after harvest at 95 degrees F until crispy — do not over-dry.
Storage & use
Dried whole leaves: crumble into hot tea or steep as a sweet herbal infusion. Store dried leaves in airtight jars for up to 1 year. Grind dried leaves into a fine powder for use as a sugar substitute (30-150 times sweeter than sugar — use very small amounts). Fresh leaves can be muddled into drinks.
Useful for growing stevia
A few things that make this one easier — chosen for this plant, not a generic list.
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