From Seed to Harvest: How to Grow Aubergines at Home

How to Grow Aubergines

Before you start growing aubergines, it’s important to gather the right materials. Having everything ready from the outset will make the process much smoother and increase your chances of success.

Seeds and Plants

You can either start from seed or buy young plants. I always prefer seeds because you get access to more interesting varieties, and it’s considerably cheaper if you want to grow several plants. Look for varieties bred for cooler climates if possible. Some types mature more quickly than others, which is particularly helpful given our shorter growing season. You’ll want to choose between traditional large-fruited varieties and the smaller, quicker-maturing types depending on your space and patience levels.

Growing Equipment and Supplies

You’ll need seed trays or small pots (7-9cm), multipurpose compost for sowing, larger pots (at least 30cm diameter) for the final planting, a good quality potting compost enriched with organic matter, plant labels, and bamboo canes or stakes for support. If you’re growing in a greenhouse or polytunnel, make sure you’ve got adequate ventilation sorted. A heated propagator is helpful but not essential if you’ve got a warm windowsill. You’ll also need a watering can with a fine rose, liquid feed (tomato feed works brilliantly), and some fleece or cloches if you’re attempting outdoor growing.

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Step-by-Step Instructions

Sowing Your Aubergine Seeds

I start sowing aubergine seeds between late February and early April. The earlier you can start them, the better, as aubergines need a long growing season. Fill your seed trays or small pots with multipurpose compost, water well, and allow to drain. Sow seeds thinly on the surface and cover with about 5mm of compost. The seeds need warmth to germinate properly, ideally around 21-25°C, so a heated propagator is useful here. If you don’t have one, a sunny windowsill above a radiator works well, though you might need to cover the pots with a clear plastic bag to maintain humidity.

Germination typically takes 10-21 days. I’ve found that aubergine seeds can be a bit slow and erratic, so don’t panic if they take their time. Once the seedlings emerge, remove any covering and move them to a bright spot. Keep the compost moist but not waterlogged. When the seedlings develop their first true leaves (the second set of leaves that appear), you can prick them out into individual 7-9cm pots filled with fresh compost.

Potting On and Early Care

As your seedlings grow, they’ll need moving into progressively larger pots. I usually pot them on when roots start appearing at the drainage holes. Eventually, they’ll need their final containers, which should be at least 30cm in diameter or large growing bags if you prefer. Use a good quality compost mixed with some well-rotted organic matter. Aubergines are hungry feeders, so they need nutrient-rich soil.

Throughout this stage, maintain warm conditions (at least 15°C at night, ideally 21-27°C during the day) and ensure plants receive plenty of light. I’ve found that aubergines can become leggy and weak if they don’t get enough light, particularly during our gloomy spring weather. Turning plants regularly helps them grow evenly. Water consistently, keeping the compost moist but never soggy. Cold, waterlogged conditions will set plants back significantly or even kill them.

Planting Out and Positioning

Aubergines should not go outside or into an unheated greenhouse until all risk of frost has passed, usually late May or early June depending on your location. In Scotland and northern England, you might want to wait until mid-June to be safe. I grow mine exclusively in a polytunnel here in Gloucestershire, which gives them the consistent warmth they need.

Choose the warmest, sunniest spot available. In a greenhouse, this means the south-facing side if possible. Space plants about 60cm apart to allow for good air circulation. If you’re brave enough to try outdoor growing, select the most sheltered, south-facing spot in your garden and be prepared to provide cloche or fleece protection if temperatures drop. Honestly though, I wouldn’t recommend outdoor growing unless you’re in a particularly mild area like Cornwall or parts of Kent.

Supporting and Pinching Out

Once plants reach about 30cm tall, pinch out the growing tip to encourage bushier growth and more fruiting sideshoots. Insert a sturdy bamboo cane next to each plant and tie the main stem loosely as it grows. Aubergine plants can become quite heavy when laden with fruit, so proper support is essential.

As flowers appear, you may need to help with pollination if growing under cover. I gently tap the flowers or use a small paintbrush to transfer pollen between blooms. This isn’t always necessary, but it can improve fruit set, particularly early in the season when there are fewer insects about.

Feeding and Watering Throughout the Season

Water regularly and consistently. Aubergines hate drying out, and irregular watering can lead to bitter fruit or blossom end rot (a calcium deficiency disorder that causes dark, sunken patches on the fruit). I water mine every day during hot weather, less frequently when it’s cooler. The key is keeping the soil evenly moist.

Start feeding with a high-potash liquid fertiliser (the same type you’d use for tomatoes) once the first fruits begin to form. I feed weekly, following the manufacturer’s instructions. This regular feeding is crucial for good fruit development. Aubergines are greedy plants, and without adequate nutrition, you’ll get poor crops of small, disappointing fruits.

Fruit Thinning and Harvesting

When fruits start forming, you may need to thin them. I usually allow 5-6 fruits per plant in our climate. It’s tempting to let them all develop, but fewer fruits means larger, better-quality aubergines. Simply remove the smallest fruits or any that look misshapen.

Harvest aubergines when they’re glossy and firm, typically from July onwards. The skin should be shiny; if it looks dull, the fruit is past its best. Use secateurs to cut the fruit with a short piece of stem attached, as the stems can be quite tough and woody. Don’t leave fruits on the plant too long, as this will reduce overall production. Regular harvesting encourages the plant to produce more.

Common Mistakes to Avoid

Temperature-Related Errors

The biggest mistake I see people make is underestimating aubergines’ heat requirements. These plants simply won’t thrive in cold conditions. I’ve watched neighbours struggle with outdoor plants that sit there looking miserable, barely growing and certainly not fruiting. Don’t rush to plant them out, and don’t attempt outdoor growing unless you’ve genuinely got a warm, sheltered microclimate. Even then, have a backup plan for cold spells.

Similarly, dramatic temperature fluctuations cause problems. Aubergines like consistency. Opening and closing greenhouse vents to maintain steady temperatures throughout the day is important, particularly during those unpredictable British summer days when it can be scorching at noon and chilly by evening.

Watering and Feeding Issues

Irregular watering is another common problem. I’ve made this mistake myself when I’ve been away for a few days and someone else has been watering. The plants can cope with brief dry spells, but it affects fruit quality. Conversely, overwatering in cool conditions leads to root rot and fungal diseases. The soil should be moist but not saturated.

Neglecting to feed is equally problematic. I’ve seen gardeners treat aubergines like low-maintenance crops, wondering why they get tiny fruits or none at all. These plants need regular feeding once fruiting begins. Missing this step will seriously compromise your harvest. On the flip side, overfeeding with nitrogen-rich fertilisers produces lots of leafy growth at the expense of fruits, so choose your fertiliser carefully.

Pest and Disease Management

Ignoring early signs of pest problems can quickly lead to disaster. Red spider mite absolutely loves aubergines, particularly in warm greenhouse conditions. I check the undersides of leaves regularly for the telltale fine webbing and tiny mites. Catching infestations early makes them much easier to control. Whitefly and aphids can also be problematic.

Maintaining good air circulation helps prevent fungal diseases like grey mould and powdery mildew. Don’t crowd plants together, and remove any yellowing or diseased leaves promptly. I’ve learned that prevention is far easier than cure when it comes to greenhouse diseases.

Expert Tips

Variety Selection for British Conditions

Not all aubergine varieties are created equal for our climate. I’ve had best success with varieties specifically bred for cooler conditions or those that mature relatively quickly. ‘Moneymaker’, despite its rather uninspiring name, is reliable and produces well. ‘Black Beauty’ is the classic variety, though it needs a long season. I’m particularly fond of the smaller-fruited types, which mature faster and are less demanding.

White and striped varieties are worth trying once you’ve mastered the basics. They taste similar to purple types but look spectacular on the plate. Just remember that white varieties can be slightly less vigorous, so give them the best spot in your greenhouse.

Maximising Greenhouse Space

If space is limited, consider growing aubergines in large pots rather than greenhouse borders. This allows you to move them to the warmest spots and makes crop rotation easier. I grow mine in 40cm pots, which gives the roots plenty of room whilst keeping plants manageable. You can also grow them alongside tomatoes, as they have similar requirements, though aubergines generally prefer slightly warmer conditions if you can provide it.

Extending the Season

In a heated greenhouse, you can extend both ends of the growing season significantly. However, the cost of heating needs balancing against the value of the crop. I find it more economical to start seeds early on a heated propagation mat, then move plants to an unheated greenhouse once temperatures rise. At the other end, plants will continue fruiting well into autumn if protected from frost. I’ve harvested aubergines as late as October in mild years.

Dealing with Specific Challenges

If you’re getting lots of flowers but no fruit set, temperature is usually the culprit. Aubergines drop flowers if nights are too cold (below 15°C) or if daytime temperatures exceed 35°C (which can happen in greenhouses during heatwaves). Adequate ventilation helps moderate temperature extremes. Hand pollination can also improve fruit set when conditions aren’t ideal.

Blossom end rot, which shows as dark, sunken areas on the fruit base, indicates calcium deficiency, usually caused by irregular watering. Once you see it, those fruits are ruined, but you can prevent it affecting subsequent fruits by maintaining consistent soil moisture. Some gardeners swear by adding crushed eggshells to the compost, though I’ve found that simply watering properly is more effective.

Frequently Asked Questions

Can you grow aubergines outdoors in the UK?

You can attempt outdoor aubergine growing in sheltered, south-facing positions in milder regions, particularly across southern England, but success rates are variable and heavily dependent on weather conditions. I’ve seen decent crops from outdoor plants in exceptionally warm summers in places like Devon and Sussex, but most years you’ll get far better results with greenhouse or polytunnel cultivation. The plants need consistent warmth that our outdoor climate simply doesn’t reliably provide. If you do try outdoor growing, use cloches or fleece to extend the season and protect against cool spells, and choose quick-maturing varieties. Be prepared for disappointment though; aubergines are genuinely challenging outdoors here.

How long do aubergines take to grow from seed to harvest?

Aubergines typically take between 16 and 24 weeks from sowing to first harvest, depending on variety and growing conditions. Quick-maturing varieties might produce fruit within four months, whilst traditional large-fruited types can take five to six months. This long growing season is precisely why starting seeds early (February or March) is so important in our climate. The plants need warm conditions throughout this period, so factor in the time they’ll spend in propagation and growing on before they even go into their final positions. Once fruiting begins, you can continue harvesting for several months if conditions remain favourable, so one plant can produce multiple fruits over an extended period.

Why are my aubergine flowers dropping off without setting fruit?

Flower drop usually indicates temperature stress, either from nights that are too cold (below 15°C) or excessive daytime heat (above 35°C in greenhouses). Aubergines are quite fussy about temperature ranges. Insufficient pollination can also cause flower drop, particularly early in the season when pollinating insects are scarce under cover. Try hand-pollinating by gently tapping flowers or using a small brush to transfer pollen between blooms. Stress from irregular watering, sudden environmental changes, or nitrogen-heavy feeding can also trigger flower drop. Maintaining consistent conditions is key. If you’re growing in a greenhouse, proper ventilation to moderate temperature extremes makes a significant difference to fruit set rates.

What pests and diseases commonly affect aubergines?

Red spider mite is the most troublesome pest for greenhouse aubergines, thriving in warm, dry conditions. You’ll notice fine webbing on leaves and yellowing foliage. Maintaining humidity and introducing biological controls works well. Whitefly and aphids also attack aubergines, clustering on new growth and undersides of leaves. Greenhouse-grown plants can suffer from grey mould and powdery mildew if air circulation is poor. Verticillium wilt, a soil-borne fungal disease, causes wilting and yellowing; there’s no cure, so prevention through crop rotation and good hygiene matters. Outdoor plants occasionally face flea beetle damage. Regular monitoring catches most problems early when they’re easier to manage. I check my plants thoroughly twice weekly during the growing season.

Do aubergines need staking and support?

Yes, aubergines definitely need support. The plants can reach 60-90cm tall and become quite heavy once laden with fruit. I stake each plant with a sturdy bamboo cane inserted at planting time, tying the main stem loosely as it grows. Without support, stems can break under the weight of developing fruits, particularly if you’re growing large-fruited varieties. Some gardeners prefer to use tomato cages or create a framework of canes and string. The method matters less than ensuring plants have adequate support before they need it; trying to stake a fully-grown, fruiting plant without damaging it is difficult. Proper staking also improves air circulation around plants, reducing disease risk, and makes harvesting considerably easier.

When should you pick aubergines and how do you know they’re ready?

Harvest aubergines when they’re firm and glossy, with shiny, taut skin. The exact size depends on variety, but generally you want them at a good usable size before the skin loses its shine. Dull skin indicates overmaturity; the fruit will be seedy and potentially bitter. Press the skin gently with your thumb; it should bounce back rather than leaving an indentation. Cut fruits with secateurs, leaving a short stem attached, as pulling can damage the plant. Regular harvesting encourages more fruit production, so don’t leave mature aubergines on the plant too long. I typically start harvesting in July and continue through to September or even October in mild years. It’s better to pick slightly early than too late, as younger fruits have better flavour and texture.

Moving Forward with Your Aubergine Growing

Growing aubergines successfully in our British climate requires attention to detail and an understanding of what these heat-loving plants need. Whilst they’re more demanding than many vegetables, they’re absolutely achievable with the right approach. I’ve found that once you’ve mastered the basics of temperature management, consistent watering, and adequate feeding, aubergines become a reliable and rewarding crop.

Start small if you’re new to growing them. One or two plants will teach you what works in your specific conditions without overwhelming you. Pay attention to how your plants respond to different temperatures and watering regimes, adjusting your approach based on what you observe. Each growing season builds your understanding and improves your results.

The beauty of growing your own aubergines is the variety available to you. Once you’ve succeeded with standard purple types, experiment with different colours, shapes, and sizes. The eating quality of freshly picked aubergines surpasses anything you’ll find in shops, and you’ll have the satisfaction of growing something many people assume is impossible in our climate. With proper care and the right environment, you’ll be harvesting glossy, perfect aubergines from your greenhouse throughout the summer months.

Author: Megan Walker

Megan focuses on seasonal food, kitchen garden growing, and how households can reconnect with where their food comes from. Her writing blends practical growing advice with ideas for cooking and eating in season. With a passion for fresh ingredients and sustainable living, Megan’s articles help readers make the most of local produce while supporting British farms.