Stevia is a tender perennial herb from South America that US gardeners grow for its intensely sweet leaves, which taste many times sweeter than table sugar when you nibble a fresh green leaf straight off the plant. In most of the country it is treated as a warm-season annual because it cannot survive a hard freeze, though gardeners in the mildest coastal and Deep South areas can keep it going year after year. Its low-calorie sweetness makes it a favorite for flavoring iced tea, lemonade, and homegrown herbal blends.

When and how to plant

Stevia is a warm-season plant that will not tolerate frost, so set it out only after the last spring frost has passed and the soil has warmed, usually a week or two after your average last-frost date. Because the tiny seeds germinate slowly and unevenly, most gardeners start them indoors about 8 weeks before that date or simply buy transplants. Choose a spot with full sun in cooler regions and light afternoon shade in the hot South, and plant in loose, well-drained soil rich in organic matter with a near-neutral pH.

Care

Stevia has shallow roots and prefers steady, even moisture, so water regularly and never let the soil dry out completely, but avoid soggy conditions that rot the roots. Feed lightly with a balanced or slightly lower-nitrogen fertilizer, since too much nitrogen makes leggy growth and dilutes leaf flavor. Space plants about 18 inches apart to allow good airflow, and pinch back the growing tips when plants reach 8 to 12 inches tall to encourage a bushy, well-branched habit.

Common problems

Stevia is fairly trouble-free, but aphids, whiteflies, and slugs can bother tender young growth, and spider mites may appear in hot, dry spells; a strong spray of water or insecticidal soap usually keeps them in check. Root and stem rots are the main disease risk and are almost always caused by poorly drained or overwatered soil, so the simplest prevention is a raised or well-drained bed and moderate watering. Good spacing and airflow also reduce leaf spot and mildew problems in humid regions.

Harvest

You can begin snipping individual leaves and stem tips once the plant is well established and bushy, usually within a month or two of transplanting. For the sweetest, most concentrated leaves, harvest in late summer or early fall just before the plant begins to flower, since flowering can turn the flavor slightly bitter. Cut whole stems in the cool of the morning and strip the leaves, or shear the plant back by about half and let it regrow for a second cutting.

Growing Stevia in containers

Stevia is well suited to containers, particularly because it must be protected from freezing temperatures in much of the United States. Use a 3 to 5-gallon pot at least 10 to 12 inches deep with drainage holes and light, well-drained potting mix. Water when the surface begins to dry, avoiding both drought stress and soggy roots, and fertilize lightly every 4 to 6 weeks. Keep it in full sun, pinch tips for a bushier plant, and bring it indoors before frost where necessary.

Watering & feeding Stevia

Aim for roughly 1 inch of water per week, adjusting for rainfall, heat, and soil type. Stevia has average water needs and is somewhat drought tolerant once established, though extended dryness reduces growth. Water at the base, deeply enough to moisten the root zone, then allow the surface to dry a little before watering again. Mulch helps moderate soil moisture, and containers dry faster than garden beds. Wilting in dry soil signals thirst, while yellow leaves and limp growth in wet soil can indicate excess water.

Prepare soil with compost and ensure good drainage before planting. Use light, balanced feeding because stevia does not need heavy nitrogen, and excess fertility can produce overly leafy, less concentrated growth. Add compost at planting, then feed lightly once in early summer if growth is weak or the soil is poor. Do not fertilize heavily late in the season, and avoid frequent nitrogen applications. Plant in raised beds or well-drained containers where soils stay wet after rain. Let plants establish before expecting them to tolerate brief dry spells.

Saving Stevia seeds

Stevia can be grown from seed, but it is often variable and seed may have low viability, so save only from open-pollinated plants if you want the closest chance of similar offspring, F1 hybrids do not come true. Let flower heads dry on the plant, collect them before wind disperses the seeds, and separate the small seeds from the fluffy pappus without using wet processing. Dry briefly and store cool, dark, and dry, but sow as soon as practical because stevia seed commonly remains reliable for only about 1 year.

Stevia companion plants

Plant stevia with compact, sun-loving herbs and flowers such as basil, alyssum, calendula, or marigolds, provided the bed has well-drained soil and regular moisture. Nearby flowering plants can support pollinators and beneficial insects without competing heavily with stevia's relatively modest root system. Specific companion-planting evidence for stevia is limited, so choose neighbors primarily for matching light, water, and spacing needs. Avoid large, fast-growing vegetables and aggressive perennial herbs nearby, because they can shade stevia and compete for water and nutrients.

Frequently asked questions about Stevia

General guidance for US home gardens. Reference figures are typical values; your exact timing depends on your local frost dates and variety. Page updated Aug 4, 2026.