Overwintering pepper plants

Is overwintering worth attempting?

Hot and chile peppers overwinter reliably; sweet and bell peppers are significantly less resilient and often struggle indoors. If you grow primarily bells, replanting from seed each year may be more practical. For hot peppers — especially large, established plants in containers — overwintering is straightforward and saves months of growing time.

The two approaches are dormancy (simpler, lower light needed) and active growth (more demanding, requires supplemental lighting). Most home growers use the dormancy method.

Preparing plants before bringing them indoors

Before the first frost, inspect plants carefully for aphids, spider mites, and whitefly. Treat any infestation outdoors rather than carrying pests inside. Remove all fruit from the plant — allowing the plant to ripen fruit over winter wastes energy better spent on survival.

Prune the plant back hard, removing most foliage and all flower buds. Trim roots and foliage equally, then repot into a small container — a 1-gallon pot is sufficient for a dormant plant — using fresh potting mix. This reduces the space and resources the plant needs to maintain itself.

1. Inspect the plant and treat any pest infestations outdoors.
2. Harvest or remove all fruit.
3. Cut the plant back, removing most foliage and all flower buds, leaving a framework of main stems.
4. Trim roots to match the pruned top growth, then repot into a 1-gallon pot with fresh potting mix.
5. Move indoors before nighttime temperatures drop below 50°F.

Temperature and location for dormancy

A dormant pepper needs to be kept above 50°F at all times — temperatures at or below 50°F will injure or kill the plant. A cool basement, heated garage, or spare room that stays in the 50–60°F range is ideal. The plant does not need warmth, just protection from freezing.

Even a dormant plant needs some light. A bright window or a single low-intensity grow light run for a few hours a day is adequate; without any light the plant will weaken over several months. A location that receives indirect natural light near a window is sufficient if supplemental lighting is not available.

Watering and feeding during dormancy

Water very sparingly during dormancy — approximately every 3–4 weeks, just enough to keep the roots from desiccating completely. Do not fertilize. Overwatering dormant plants is a common cause of root rot and plant death during winter.

If new leaves or flower buds begin to emerge during the dormant period, remove them. The plant does not have enough light to support productive new growth indoors in winter, and forcing vegetative growth weakens the root system.

Active growth approach (optional)

If you want the plant to continue growing and possibly fruit over winter, it needs daytime temperatures around 70°F, nighttime temperatures above 50°F, and supplemental grow lighting — natural window light alone is insufficient for active growth in most climates. Water and fertilize as needed for a growing plant, being careful not to overwater.

Peppers grown indoors will not be pollinated by insects, so if flowers develop you will need to hand-pollinate by gently shaking the plant or transferring pollen between flowers with a small brush.

Returning plants outdoors in spring

Begin hardening off the overwintered plant 2–3 weeks before your last frost date, just as you would a transplant. Move it outside for a few hours each day in a sheltered spot, gradually increasing sun and wind exposure over 7–10 days. Do not transplant to the garden until nighttime temperatures consistently stay above 55°F.

Once moved back outdoors and temperatures warm, the plant will break dormancy quickly. Resume regular watering and begin fertilizing with a balanced fertilizer. Expect fruit significantly earlier in the season than from a same-year transplant.

1. About 6–8 weeks before last frost, move the plant to a warmer, brighter indoor spot and resume light fertilizing to encourage new growth.
2. Once new growth is active, begin hardening off by placing the plant outside for 2–3 hours in a sheltered spot.
3. Increase outdoor exposure by 1–2 hours per day over 7–10 days.
4. After hardening off and once nighttime lows are consistently above 55°F, transplant to the garden and water in well.