Courgettes

01 About

One plant can feed a family — and more. Courgettes are the most productive crop in the British kitchen garden, capable of producing dozens of fruits throughout summer from a single plant. They are fast, generous, and forgiving to grow, with the main challenge being to harvest regularly enough to keep pace with production. Left unpicked for even a few days a courgette becomes a marrow. But harvested young and often, they are among the finest vegetables you can grow — sweet, tender, and nothing like the oversized specimens found in shops.

02 What to Grow

Courgettes divide into two broad groups: standard green-fruited types and the increasingly popular coloured varieties — yellow, striped, and pale green. There are also compact bush forms bred specifically for container and patio growing. Understanding the differences helps you choose the right variety for your space, and the right harvest timing for the best flavour. All types produce both male flowers (on long straight stems) and female flowers (with a tiny fruit at the base) — both must be present for fruit to set.

03 Varieties

The number of varieties shown for each crop is based on UK consumption data (2025/26) — the more popular the crop, the more variety choices we include.

🟢 Green Courgettes

The classic British courgette — dark green, prolific, and reliable in all UK conditions. The most widely grown group.

Defender F1

Standard Bush

The most widely grown courgette in the UK. Virus-resistant, extremely reliable, and a consistent heavy cropper from June to October. The first choice for beginners.

• AGM
• Outdoors
• Beginners
• ⭐ Reliable

Zucchini

Standard Bush

The classic Italian open-pollinated type. Slender dark green fruits with a mild, sweet flavour. An excellent choice for heritage and organic growing — seed can be saved true-to-type.

• Outdoors
• Heritage

Black Forest F1

Climbing Bush

Unusual semi-climbing habit — can be trained up a trellis or support, saving ground space. Very dark, almost black-green fruits. Ideal for small gardens where space is limited.

• Outdoors
• Container

Midnight F1

Standard Bush

Very dark, glossy almost-black-green fruits. Good yields and reliable performance across the season. A striking variety at the table and in the garden.

• Outdoors

Ambassador F1

Green · Bush

One of the most popular allotment courgettes in the UK. Vigorous and prolific, with smooth mid-green fruits and excellent disease resistance. Easy for beginners.

• Outdoors
• Beginners

Verde di Milano

Green · Bush

Traditional Italian heritage variety with dark-speckled green skin and a rich, nutty flavour. Open plant habit makes harvesting easy. A fine heritage choice.

• Outdoors
• Heritage

🟡 Yellow Courgettes

Bright yellow fruits with a slightly milder, sweeter flavour than green types. Equally productive and considerably easier to spot when harvesting.

Soleil F1

Standard Bush

Bright golden-yellow fruits with crisp texture and sweet flavour. Very reliable F1 hybrid with strong disease resistance. Highly decorative on the plant and in the kitchen.

• F1
• Outdoors
• ⭐ Flavour

Parador F1

Standard Bush

Compact plant producing lemon-yellow fruits of excellent flavour. RHS Award of Garden Merit winner. Particularly good eaten raw in salads when harvested at 10–12cm.

• F1
• Outdoors
• AGM
• ⭐ Flavour

Yellow Patio F1

Compact Bush

Dwarf plant bred specifically for patio containers. Bright yellow fruits on a compact, self-contained plant. Very ornamental and practical.

• F1
• Container
• Outdoors

🌿 Striped & Heritage

Traditional Italian and heritage varieties with striking striped or pale green skins. Often considered the finest flavoured of all courgette types.

Romanesco

Standard Bush

Italian heritage variety with distinctive pale green, ridged fruits and a rich, nutty flavour considered by many cooks to be the finest of all courgettes. Prolific and reliable.

• Heritage
• Outdoors
• ⭐ Flavour

Striato di Napoli

Standard Bush

Classic Italian striped variety with pale and dark green marbling. Excellent mild flavour and open habit that makes harvesting easy. A traditional favourite.

• Heritage
• Outdoors

Cocozelle

Standard Bush

One of the oldest Italian courgette varieties. Dark and light green stripes. Outstanding flavour at 12–15cm. A genuine kitchen garden classic.

• Heritage
• Outdoors
• ⭐ Flavour

🪴 Compact & Container

Dwarf and compact varieties bred specifically for patio containers, raised beds, and small gardens where standard varieties would be too vigorous.

Patio Star F1

Compact Bush

Extremely compact plant that performs well in large containers. Dark green fruits. The benchmark variety for patio and small garden growing.

• F1
• Container
• Beginners

Astia F1

Compact Bush

One of the most compact courgettes available — genuinely container-suitable in a large (40cm+) pot. Dark green fruits with good yields for its size.

• AGM
• F1
• Container

One Ball F1

Round Bush

Round, tennis-ball shaped yellow fruits on a compact plant. Harvest when apple-sized for the finest flavour. Striking, unusual, and very practical for small spaces.

• F1
• Container
• Outdoors

04 Where to Source

Courgette seeds are widely available, inexpensive, and highly reliable to germinate. Because they grow so fast, sourcing is simple — the main priority is selecting the right variety for your space before ordering.

📬 Seeds by Post

The best source for variety choice. Specialist seed companies carry the full range including Italian heritage types, coloured varieties, and compact container forms. Order from January. Because courgettes are fast-growing there is no pressure to order as early as tomatoes — March is perfectly fine for most UK growers.

🏪 Garden Centres

Garden centres stock a reliable range of courgette seeds from February and young plants from May. Variety choice is narrower than online — typically Defender F1, a yellow type, and perhaps Romanesco — but plants are easy to assess before purchase and staff are usually helpful.

🛍️ Plant Sales & Markets

Community plant sales, farmers' markets, and allotment swaps are an excellent source of young courgette plants in May. Because courgettes are fast to produce from seed, locally grown plug plants are usually excellent quality and very keenly priced.

🤝 Friends & Neighbours

Courgettes produce prolifically and most growers end up with surplus seed. Ask at your allotment or growing community — you are unlikely to need to buy seed at all after your first year if you grow open-pollinated types like Romanesco or Zucchini and save a little seed.

05 Planting Options

🌍 Direct Outdoor

The simplest and most reliable method from May onwards. Sow two seeds on their side, 2–3cm deep, in a prepared planting hole enriched with compost and well-rotted manure. If both germinate, remove the weaker seedling at soil level. Cover with a cloche or cut plastic bottle for the first few weeks for protection from late frosts and slugs. Direct-sown plants often catch indoor-sown ones within a fortnight, as they avoid any transplant check.

Suitable varieties: All varieties. Best from late April in southern UK, mid-May northwards.

🏠 Indoor Start

Starting courgettes indoors gives a 2–3 week head start over direct sowing. Sow in 9cm pots — one seed per pot placed on its side — in late April or early May. Keep warm (minimum 20°C). Germination is rapid, usually within 5–7 days. Do not sow too early: courgettes grow very fast and plants left too long in pots become pot-bound and difficult to establish. Harden off over 7–10 days before planting out — do not rush this step after frost.

Suitable varieties: All varieties. Particularly useful in northern UK where the outdoor season is shorter.

🌱 Raised Beds

Courgettes thrive in raised beds — improved drainage, faster soil warming in spring, and easier access for the daily harvesting they need. Prepare the bed by mixing generous quantities of well-rotted manure or garden compost into the top 30cm. Allow at least 90cm per plant — courgettes spread widely. Plant with the rootball slightly proud of the surrounding soil surface to prevent crown rot. Water in well after planting.

Suitable varieties: All varieties. A standard 1.2–1.5m wide raised bed comfortably holds one plant at each end.

🪴 Containers

Courgettes can be grown in large containers but require a minimum 40–50 litres of compost — a 45–50cm diameter pot. Use peat-free multipurpose compost enriched with slow-release fertiliser granules at planting time. Watering is critical: courgettes in pots may need watering twice daily in warm weather. Regular liquid feeding (weekly high-potash feed from first flower) is essential — container compost runs out of nutrients within 4–6 weeks.

Suitable varieties: Patio Star F1, Astia F1, One Ball F1, Yellow Patio F1. Standard varieties are too vigorous for most containers.

06 Companion Planting

✅ Grow nearby

• 

  🌸 Nasturtiums

  Sacrificial trap crop — aphids flock to nasturtiums instead of courgettes. Also attract hoverflies that prey on blackfly. Plant at the bed perimeter or between plants.

• 

  🌿 Borage

  Borage is said to deter tomato hornworm and improve the flavour of neighbouring plants. Its blue flowers attract pollinators essential for courgette fruit set.

• 

  🌽 Sweetcorn

  The traditional Three Sisters combination. Sweetcorn provides height, courgettes provide ground cover suppressing weeds. Both thrive in rich, warm soil.

❌ Keep apart

• 🥔 Potatoes — Both susceptible to similar soil-borne diseases. Rotate each year to reduce build-up.
• 🌿 Fennel — Fennel root compounds inhibit the growth of nearby vegetables including courgettes.
• 🎃 Squash & Pumpkins — All Cucurbita species will cross-pollinate freely — keep apart if saving seed true-to-type.

07 Sowing — How To

Courgettes are one of the easiest crops to sow. The main risk is sowing too early — plants grow so fast that they outgrow their pots before conditions allow planting out. Aim for late April to early May for indoor sowing in most UK regions. No heated propagator is needed — a warm windowsill at 18–22°C is sufficient.

1. 

   Fill pot

   Use a 9cm pot filled to within 1cm of the rim with moist seed compost. One pot per seed — courgettes dislike root disturbance and do not transplant as well from shared trays.

2. 

   Sow on edge

   Place one seed on its side in the centre of the pot at a depth of 2–3cm. Sowing on edge prevents the seed sitting flat in a puddle, which can cause rotting before germination.

3. Cover and firm

   Cover with 2–3cm of compost or vermiculite. Firm gently — do not compress.

4. Label clearly

   Label each pot with variety name and sowing date. If growing more than one type, this step is essential.

5. Water and warm

   Water with a fine rose and place somewhere warm — 20°C minimum. A windowsill above a radiator works well. No propagator is needed for courgettes.

6. 

   Germination

   Germination typically occurs within 4–7 days in warmth. Move immediately to the brightest south-facing windowsill once the seedling emerges — courgettes go leggy in low light within days.

7. 

   Grow on

   Keep in a bright spot. Water when the surface is dry. Do not overwater — soggy compost causes damping off. Plants are ready to plant out when the first true leaves have opened fully, usually 2–3 weeks after germination.

8. 

   Harden off

   One week before planting out, begin hardening off — place pots outside in a sheltered spot during the day, bring in at night. Gradually increase outdoor exposure over 7–10 days. Do not rush this step.

Regional sowing timing

Region	Sow / plant	Harvest	Notes
Scotland & Far North	Mar–May	Jun–Sep	Direct sow outdoors from late May under cloche protection · Early May indoors
Northern England	Mar–May	Jun–Sep	Direct sow outdoors from mid-May with fleece protection · Late April–early May indoors
Midlands & Wales	Feb–Apr	May–Sep	Direct sow from early May in sheltered spots · Mid-April–early May
Ireland & Isle of Man	Feb–Apr	May–Sep	Direct sow from early May in sheltered spots · Mid-April–early May
South & SE England	Feb–Apr	May–Oct	Direct sow from late April in warm, sheltered spots · Early–mid April
South Coast & SW	Feb–Apr	May–Oct	Earliest reliable UK start — direct sow from mid-April · Late March–early April

08 Using a Propagator

Courgettes do not require a heated propagator — they germinate readily in a warm room at 18–22°C. A propagator or a loosely draped polythene bag over the pot is useful mainly to maintain humidity during germination and prevent the compost surface drying out.

Heated propagator

A heated propagator works well for courgettes but is not essential. If using one, set to 20–22°C. Because courgettes germinate in just 4–7 days, the main advantage is reliability in early spring when room temperatures are variable — it ensures consistent warmth overnight.

1. 

   Prepare pot

   Fill a 9cm pot with moist seed compost. Place the seed on its side, cover with 2–3cm of compost, and firm lightly.

2. 

   Add to propagator

   Place the pot in the propagator or cover loosely with a polythene bag. Set heated types to 20–22°C. A warm shelf or airing cupboard also works well for the germination period.

3. 

   Monitor daily

   Check moisture daily — compost should remain moist but never waterlogged. Courgette seeds rot readily in cold, wet compost.

4. 

   Remove cover immediately

   Remove the lid or bag the moment the seedling appears — typically within 4–7 days. Do not delay: courgettes grow very fast and quickly become drawn and weak in restricted space.

5. 

   Move to light

   Transfer immediately to the brightest spot available — a south-facing windowsill is ideal. Without good light, courgette seedlings become leggy and weak within days.

09 Soil Requirements

pH

5.5–7.0

Best

Loam, Clay loam

Tolerates

Sandy loam

Avoid

Waterlogged

10 Ongoing Care

💧 Watering

Water deeply and consistently at the base of the plant — never overhead. Courgettes need significant water once fruiting begins, particularly in dry spells. Inconsistent watering causes bitter fruits and blossom end problems. Mulch around plants to retain moisture.

🌿 Feeding

Once the first fruits begin to swell, feed every two weeks with a high-potash liquid fertiliser. Courgettes are hungry plants — regular feeding sustains the heavy cropping over a long season. A balanced general feed earlier in the season supports leafy establishment.

🥒 Harvesting Regularly

Harvest courgettes when 10–15cm long — never let them grow into marrows. Picking regularly is the single most important care task: a plant that is regularly harvested keeps producing prolifically. Check plants every 1–2 days in peak summer. Cut cleanly with a sharp knife.

🐝 Pollination

Poor fruit set is almost always a pollination failure. In cool or wet weather, transfer pollen from a male flower (no swelling at the base) to a female flower (small courgette visible behind the petals) using a soft brush or your fingertip. Do this in the morning when flowers are open.

11 Watch Out For

🐛 Insects & pests

• 🐜 Aphids (Blackfly & Greenfly) — Curled, distorted, or stunted growing tips — aphids inject saliva that causes leaf curl to protect them
• 🕷 Spider Mite — Fine, silky webbing on the underside of leaves and between growing tips — the definitive identification sign
• 🐌 Slugs & Snails — Silver slime trails on leaves, soil, and pots — often the first sign before damage is found
• 🤍 Mealybug — White, fluffy or mealy patches in leaf axils, stem joints, and under leaves — the insects themselves

🍄 Diseases to watch

• ⬜ Powdery Mildew — Powdery mildew is caused by a range of related fungi, each specific to its host plant — courgette mildew cannot infect peas, and vice versa. The characteristic white powdery coating on leaf surfaces appears in warm, dry conditions (unlike downy mildew which prefers cool and wet). Rarely kills plants but severely reduces yield and plant vigour.
• 🩶 Botrytis (Grey Mould) — Botrytis cinerea (grey mould) is the most ubiquitous fungal pathogen in temperate gardens — present in virtually every garden soil and on plant debris. It becomes a disease only when conditions favour it: cool, humid, poorly ventilated environments with damaged or senescent plant tissue. In a greenhouse in autumn it can destroy an entire tomato or grape crop.
• 🌿 Mosaic Virus (TMV / CMV) — Tobacco mosaic virus (TMV) and Cucumber mosaic virus (CMV) are among the most widespread plant viruses affecting vegetable crops worldwide. TMV is extraordinarily stable — it can remain viable on contaminated hands and tools for years, and even survives in processed tobacco. There is no cure; infected plants must be destroyed.

Full identification and treatment advice is in the Pests and Diseases sections.

12 Storage & Preserving

🥒 Fresh Storage

Freshly harvested courgettes keep in the fridge for up to a week. Store unwashed in the salad drawer. Do not attempt to store raw courgettes at room temperature for more than 1–2 days — they deteriorate quickly. For the best flavour cook or eat on the day of harvest. Courgettes at 10–15cm are far superior in flavour and texture to larger specimens — once they pass 20cm, the skin toughens and seed cavities enlarge.

❄️ Freezing

Courgettes freeze adequately when blanched first. Slice into 1cm rounds, blanch for 2 minutes in boiling water, refresh immediately in ice water, drain thoroughly, then freeze in a single layer on a tray before bagging. Frozen courgettes are soft on thawing and best used in soups, ratatouille, fritters, courgette cake, and baked dishes. Use within 3 months for best quality.

🫙 Preserves & Pickles

Courgette chutney is the most satisfying way to use a mid-season glut, and pickled courgette ribbons with dill and garlic are excellent with cold meats and cheese. Both are rewarding preserves that make excellent gifts. Follow a tested recipe.

🍰 Cooking a Glut

Courgette cake is one of the finest uses of a mid-season glut — grated courgette keeps bakes extraordinarily moist and adds virtually no flavour. Courgette, mint, and lemon soup is a summer standard. Ratatouille, fritters, tempura, stuffed courgette flowers, and courgette pasta are all excellent. Overgrown courgettes that have become marrows are superb stuffed with meat, rice or breadcrumbs, baked, and finished with cheese.

13 Expert Tips

14 Common Mistakes

15 See Also

• 🌼 Companion Planting
• 🔄 Crop Rotation
• 🛍️ Standard Grow Bag