How to grow capsicum in Australia 🫑

Capsicums need consistently warm soil (18°C+) and an air temperature that stays above 15°C overnight. They're slower to mature than tomatoes (75–90 days from transplant), so they need an earlier start in cooler climates and a longer warm season generally.

Capsicums are almost always grown from seedlings. Seed-to-harvest is too long for direct sowing to work in most Australian climates — start seeds indoors 8 weeks before planting out, or buy seedlings.

Spacing: 40–50cm between plants, rows 60cm apart. Capsicum plants grow into bushy 60–90cm shrubs with multiple branches. They need air movement around them, especially in humid climates.

Depth: Plant at the same depth as the seedling pot. Unlike tomatoes, capsicums don't benefit from deep planting — they root from the base of the stem, not the buried portion.

Support: Most capsicums don't need staking but can benefit from a single short stake (60cm) once they're loaded with fruit. The brittle stems break easily under fruit weight, especially in wind.

Soil: Rich, free-draining soil with plenty of organic matter. Capsicums prefer slightly acidic to neutral pH (6.0–7.0). Add a handful of pelleted chicken manure or blood and bone at planting.

Capsicums grow well in all three options, with pots particularly suited to balcony and courtyard gardening.

In-ground is the easiest option in warmer climates where the soil stays consistently warm. The unlimited root run produces larger plants and bigger harvests over a longer period.

Raised beds are ideal for marginal climates like Melbourne and Adelaide — the warmer soil helps capsicums get past the slow start they have in cooler conditions. A 30cm-deep bed against a north-facing wall is the highest-performing setup for capsicums in southern Australia.

Pots work very well, particularly for the smaller-fruited "snack pepper" varieties that have become popular. A 25–30 litre pot is enough for a single plant. Larger pots support larger plants. Capsicums in pots need consistent watering (twice daily in summer heat) and regular liquid feeding through the growing season. The advantage of pots is mobility — you can move the plant to follow the warmest position, particularly useful in marginal climates like Melbourne where catching every warm hour matters.

Full sun — 6 to 8 hours daily. In tropical and semi-arid climates, afternoon shade during the hottest part of summer prevents sun-scald on the fruit (where exposed fruit develops a leathery, bleached patch from direct sun in extreme heat).

Water deeply and consistently. Capsicums are sensitive to inconsistent watering — the plants drop flowers and developing fruit if they get too dry, and develop blossom end rot if soil moisture fluctuates dramatically. Mulch heavily to keep soil moisture stable.

Capsicums can be harvested green (immature but edible) or left to ripen to their final colour — usually red, but depending on variety, yellow, orange, purple, or chocolate brown. Fully ripe fruit is sweeter and more flavourful but takes longer to develop, and harvesting green encourages the plant to set more flowers.

Cut fruit with secateurs rather than pulling — the stems are brittle and break easily. Pick regularly through the season to keep the plant producing.

Capsicums store well in the fridge for 1–2 weeks, freeze well chopped, and can be roasted and preserved in oil.

Sun-scald on the fruit shows up as a pale, leathery patch on the side facing the sun. Most common in semi-arid and tropical climates during extreme heat. Provide afternoon shade or grow varieties with denser foliage that protects the fruit.

Blossom drop caused by temperature extremes — nights below 12°C or days above 32°C. Mostly a problem at the edges of the growing window. The fix is timing.

Fruit fly can be a significant problem in subtropical and warm temperate zones. Use exclusion bags, traps, and pick regularly. Don't leave damaged or overripe fruit on the plant.

Anthracnose — black, sunken spots on the fruit — is a fungal disease common in humid coastal climates. Improve airflow, water at soil level, remove and dispose of affected fruit.

Plant near: Basil (the most useful neighbour — many gardeners report fewer aphid problems and basil enjoys the partial shade), parsley, carrots, and onions.

Keep away from: Fennel (releases growth-inhibiting compounds), brassicas (compete for nutrients), and avoid planting capsicums in the same bed where you grew tomatoes, eggplant, potatoes, or capsicums last season — they share soil-borne diseases.

Californian Wonder — The classic large green-to-red bell capsicum. Reliable, widely available, suitable for warm temperate to subtropical climates.

Yolo Wonder — Similar to Californian Wonder but with slightly thicker walls and better heat tolerance. A good choice for warm climates.

Mini Bell (various names) — Smaller-fruited varieties that mature faster (about 60 days). The right choice for Melbourne, Hobart, and Canberra where the season is short. Productive in pots.

Sweet Banana — A long, thin yellow-to-red capsicum, milder and sweeter than bell types. Productive over a long season. Good for warm and warm temperate climates.

Purple Beauty — Bell type with deep purple immature fruit that ripens to red. Good cool-tolerance, suits Melbourne and similar climates better than most bell types.

Chocolate Beauty — Bell type ripening to a deep chocolate brown. Sweet, rich flavour. Long ripening period — best in climates with a long warm season.