Aubergine

Aubergine (Solanum melongena) is a warm-season annual in the nightshade family, grown worldwide for its glossy, typically deep-purple fruit. Plants form bushy, upright specimens 50–75 cm tall and require sustained warmth and high light to set fruit well. The flesh is mild and creamy when cooked; fruit shapes range from the classic elongated oval to round and egg-shaped forms in purple, white, or green. In Nordic gardens, reliable cropping requires an early start indoors and a greenhouse or sheltered, south-facing position outdoors.

Growing

Start seeds indoors 10 weeks before transplanting. Sow 0.5 cm deep into moist, warm compost and maintain a germination temperature of 24–30 °C; seeds emerge in 7–14 days. After germination, reduce temperature to around 20 °C and grow on under bright light. Prick seedlings out to 5–7 cm spacing once the first true leaves appear. Harden off gradually over 10–14 days by reducing temperature incrementally before transplanting. Transplant outdoors or into a protected structure only once nights consistently stay above 10 °C and soil has warmed to at least 15 °C. Space plants 50–60 cm apart in rows 50–70 cm apart. Pinch the growing tip at 25 cm height to encourage a bushy, branching habit; retain 3 main stems.

Care

Water consistently and deeply — aubergines are drought-sensitive and uneven moisture causes bitter fruit and blossom drop. Apply a high-potassium liquid feed every 10–14 days once the first flowers open. Stake or cage plants as they fill out to prevent stem snap under fruit load. Maintain temperatures above 18 °C for continued fruit set; below 15 °C, flowering stalls. Remove any yellowing lower leaves to improve air circulation and reduce disease pressure. In greenhouses, shake plants gently or use a soft brush to aid pollination.

Harvest

Harvest fruits when skin is fully coloured, taut, and has a high gloss — this indicates seeds are still immature and flesh is at peak tenderness. Press the skin lightly: it should spring back. Dull or matte skin signals over-ripeness and seedy, bitter flesh. Cut the stem cleanly with a knife or secateurs, leaving a short stub. Harvest regularly every few days once fruiting begins; removing ripe fruit promptly stimulates continued production throughout the season.

In the kitchen

Aubergine absorbs flavours readily and suits roasting, grilling, frying, braising, and baking. Slice and roast with olive oil and garlic, layer into moussaka or parmigiana, or grill whole and scoop out the smoky flesh for baba ganoush. Salting slices and resting for 20 minutes before cooking draws out moisture and concentrates flavour, though modern varieties are rarely bitter. The skin is fully edible and holds slices together during high-heat cooking.

Storing

Store unwashed aubergines at 10–13 °C in a cool, dark place — not in a standard refrigerator, as temperatures below 10 °C cause chilling injury and rapid browning of cut flesh. Under these conditions, fruit keeps for up to 2 weeks. For longer storage, roast or grill, then freeze in portions for up to 6 months. Pickled aubergine keeps refrigerated for several weeks.