California Wonder Capsicum

Capsicum annuum (nightshade)

Also known as: Californian Wonder Sweet Pepper

The classic American heirloom bell capsicum since 1928, and the parent stock behind many modern bell varieties (including Yolo Wonder). Large, blocky, four-lobed fruit — thick-walled, crisp, and sweet — starts deep emerald green and ripens to brilliant red. Sturdy 60–75cm plants adapt well across climates, from cool temperate through to warm, and reward consistent care with abundant crops all season. The variety most Australian home gardeners grew up with.

Days to harvest 70-75 days

Fruit size 10cm blocky, four-lobed, ~170g

Sowing depth 5mm

Germination 7–21 days at 21–26 °C

Spacing 50cm apart

Aspect Full sun, moist well-drained soil

Frost tolerance Frost sensitive — needs reliably warm nights

Growing notes

Choose a full-sun spot with shelter from cold winds. California Wonder adapts more readily to cool climates than many capsicums, but still needs a long warm season to crop well.

Soil preparation: Amend soil with aged compost or well-rotted manure to ensure fertility and drainage; maintain a pH between 6.0 and 6.8.

Support: Light staking helps once heavy fruit clusters develop.

Watering & feeding: Water deeply and consistently to keep soil evenly moist; feed with a liquid fertiliser high in potassium once flowering begins. Mulch heavily to retain soil moisture. Side-dress with compost when flowers begin to form.

Harvest: Pick green for classic grassy capsicum flavour, or leave to fully ripen to red for peak sweetness and vitamin C content. Cut with secateurs approximately 2cm above the fruit to avoid breaking branches. Regular picking encourages more fruit.

Timing: Expect first harvest 70–75 days after transplanting. Continued cropping across the warm months.

Key features

Open-pollinated American heirloom (introduced 1928)
Classic blocky four-lobed bell fruit
Thick-walled, crisp, sweet flesh
Fruit to 10cm and around 170g each
Adaptable across cool to warm climates
Generous cropper across the whole season

Short season tips

Best started indoors on heat mats — capsicums need 21–26 °C soil to germinate. Sow 8–10 weeks before the last frost or purchase as 6–8-week-old seedlings. Transplant into the garden when soil temperature has reliably warmed to at least 15°C. Avoid disturbing roots when transplanting — capsicums resent being moved and stall easily. Row covers or cloches in early spring extend the season further at inland NSW's cooler end.

Spring
Summer

Tender perennial — most often grown as an annual

Basil (particularly good for capsicums) Marigolds Beans Nasturtiums

Other nightshades (tomatoes, eggplants, potatoes) Fennel

Introduced in 1928 and quickly established itself as the classic American home-garden bell capsicum. Named for California, where the selection work was done, and grown continuously ever since. Remains the standard against which newer bell varieties are measured — including Yolo Wonder, which was bred from this line in 1952 to add heat tolerance and disease resistance without losing the classic shape and flavour.