If you have already sown your pumpkin seeds this spring, now is the time to focus on the next stage of growing pumpkins, planting them outdoors and caring for them throughout the summer.
Whether you’re hoping to grow a giant pumpkin for halloween, create a pumpkin patch, or simply enjoy harvesting your own homegrown pumpkins for cooking or decoration, giving your plants the right conditions after planting out is key to a successful crop.
This guide will cover where to plant pumpkins, companions planting tips, fertilising pumpkins, hand pollination and how to care for your plants throughout the growing season.
Planting Out Pumpkins: What You Need to Know
Pumpkins are tender plants that dislike cold weather. Before planting outdoors, make sure all risk of frost has passed and soil temperatures have started to warm up.
What Month Do You Plant Pumpkins in the UK?
Pumpkin seeds are typically sown indoors between April and May. Once plants have developed several true leaves and outdoor temperatures are consistently warm, they can usually be planted outside from late May to early June.
Planting too early can slow growth or damage young plants if temperatures drop unexpectedly.
Hardening Off Pumpkin Plants
Before moving pumpkins outdoors permanently, they should be hardened off for around 7 to 10 days.
Place plants outside in a sheltered spot during the day and bring them back indoors at night. Gradually increase the amount of time they spend outside to help them adjust to wind, sunlight and changing temperatures.
Preparing the Soil
Pumpkins are hungry plants that thrive in rich, fertile soil.
Before planting, dig in plenty of compost or well-rotted manure to improve soil structure and provide nutrients. The more organic matter you can incorporate, the better your pumpkins are likely to perform.
A quality compost such as Miracle-Gro Organic Fruit and Veg Compost or adding a soil improver such as Growmoor Organic Farmyard Manure can help create the nutrient rich growing conditions pumpkins love.
Where to Plant Pumpkins
Choosing the right location is one of the most important factors when learning how to grow pumpkins successfully.
Pumpkins require:
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Full sun
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Fertile soil
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Consistent moisture
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Protection from strong winds
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Plenty of space
Growing pumpkins in Raised Beds
Raised beds are an excellent option for growing pumpkins, especially if your garden has heavy soil or drainage issues.
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Benefits of Raised Beds for Pumpkins
Raised beds warm up more quickly in spring and provide better drainage than many garden soils. They also allow you to improve soil quality more easily by adding compost and organic matter.
How Much Space Do Pumpkins Need?
Even when grown in raised beds, pumpkins need plenty of room. Most trailing varieties require at least 1.5 metres of space between plants.
Allow vines to trail beyond the edge of the bed if necessary.
Planting Pumpkins in the Ground
For gardeners hoping to create a pumpkin patch or grow large varieties, planting directly into the ground is often the best choice.
Creating a pumpkin patch
A dedicated pumpkin patch allows vines to spread naturally without competing with other crops.
Choose the sunniest area of your garden and improve the soil before planting.
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Growing Large Pumpkin Varieties
If you’re aiming to grow larger pumpkins, space is essential.
The larger the plant can grow, the more energy it can direct towards producing healthy fruit. To ensure energy directs itself towards creating large healthy fruits you remove any further flowering or fruits that form.
Growing Pumpkins Vertically
Growing pumpkins vertically is a fantastic option for smaller gardens. Smaller varieties can be trained up a sturdy trellis or support system. As fruits develop, they may need additional support using slings attached to the structure. A strong Trellis can be useful when growing pumpkins vertically.
Another creative way to grow pumpkins vertically is over a pumpkin arch. A pumpkin arch can add height and interest to a vegetable garden or pumpkin patch. Smaller varieties can be trained over a sturdy garden arch, creating an attractive feature while maximising growing space. As the fruits develop, they can be supported with slings if required.
Best Pumpkin Varieties for Vertical Growing
Smaller varieties are best suited to vertical growing, including:
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Jack Be Little
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Baby Boo
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Munchkin
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Small ornamental pumpkins
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Supporting Developing Fruits
As fruits develop, they may need additional support, fabric slings, mesh bags or old tights can be attached to a trellis to help carry the weight of the growing pumpkins.
Growing pumpkins vertically can also improve airflow around the plants and reduce the risk of disease.
Can You Grow Pumpkins in Pots?
Pumpkin gardening in pots is possible if you choose compact varieties and large containers.
Choosing the Right Container
Select a container that holds at least 40 to 60 litres of compost. Larger pots train moisture better and provide more room for roots. For container-grown pumpkins, a moisture retentive compost such as Miracle-Grow Moisture Control Peat Free Compost can help reduce watering requirements during warm weather.
Watering Pumpkins in Containers
Pumpkins grown in pots dry out much faster than those planted in the ground.
Check soil moisture regularly during hot weather and water deeply whenever needed.
Best Companion Plants for Pumpkins
Companion planting pumpkins can encourage pollinators, improve biodiversity and make the most of your growing space.
Why companion planting works
Many companion plants attract bees and pollinating insects, which are essential for pumpkin production.
Some can also help deter pests or improve the overall health of your vegetable garden.
Flowers to Plant with Pumpkins
Several flowering plants work particularly well alongside pumpkins.
Marigolds
Marigolds attract beneficial insects and add colour to the vegetable garden.
Nasturtiums
Nasturtiums act as sacrificial plants, helping to attract pests away from your crops.
Borage
Borage is highly attractive to beads and other pollinators, making it an excellent companion for pumpkins.
Vegetables to Plant with Pumpkins
Sweetcorn
Sweetcorn and pumpkins are traditional companion plants and can make good use of available growing space.
Climbing beans
Beans help support biodiversity while producing an edible crop alongside your pumpkins.
What Should Not Be Planted Near Pumpkins?
Although pumpkins are generally easy going plants, avoid placing them too close to crops that compete heavily for water, nutrients and space.
These include:
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Potatoes
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Other vigorous squash varieties
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Large cruciferous vegetables planted too closely
Providing pumpkins with adequate space will improve airflow and reduce competition.
Fertilising Pumpkins for Bigger Harvests
Pumpkins are among the hungriest plants in the vegetable garden. Regular feeding can significantly improve fruit size and overall yields.
When to Feed Pumpkin Plants
After planting out, allow pumpkins time to establish before beginning a feeding programme.
Once vigorous growth begins, regular feeding can help maintain healthy vines and foliage.
The best fertilisers for pumpkins
In the early stages of growth, a balanced fertiliser can support strong leaf and root development. As fruits begin forming, switch to a high potassium feed. Products such as Levington Organic Tomorite Concentrate are ideal for supporting flower and fruit production later in the season.
Why Potassium Matters
Potassium helps plants direct energy into flower and fruit production. Tomato feeds are often used for pumpkins once flowering begins because of their higher potassium content.
How to Hand Pollinate Pumpkins
If you notice flowers appearing but no pumpkins forming, hand pollination may help fruit production.
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Step 1: Identify Male and Female Flowers
Male flowers grow on thin stems.
Female flowers have a small swelling behind the flower that resembles a miniature pumpkin.
Step 2: Collect Pollen
Choose a freshly opened male flower in the morning a gently remove the petals
Step 3: Transfer the Pollen
Brush the pollen-covered centre of the male flower onto the centre of the female flower.
Step 4: Monitor Results
Successful pollination should result in the small fruit behind the female flower beginning to swell within a few days.
How to Care for Pumpkin Plants
Consistent care throughout summer will help maximise your harvest.
Mulch Around Your Pumpkin Plants
Applying mulch is one of the easiest ways to improve growing conditions.
Best Mulch Materials for Pumpkins
Good options include:
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Compost
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Straw
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Well-rotted manure
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Leaf mould
Mulching helps retain moisture, suppress weeds and improve soil health.
Watering Pumpkins Correctly
Pumpkins are fast-growing, moisture loving plants that rely on a steady supply of water to develop strong vines, healthy foliage and well-formed fruits. Inconsistent watering is one of the most common reasons for poor yields, so getting this right after planting out is essential.
Because pumpkins have large leaves and develop rapidly through summer, they lose a lot of moisture through transpiration. This means they are particularly vulnerable during warm, dry spells and will quickly show signs of stress if the soil is allowed to dry out.
How Often Should You Water Pumpkins?
In general, pumpkins need deep, thorough watering several times a week during dry weather, especially once they begin flowering and setting fruit. In periods of hot weather or drought, you may find they need watering every 2 to 3 days.
Rather than watering lightly every day, it is much better to deeply water at the base of the plant. This encourages roots to grow further into the soil, making the plant more resilient and better able to access moisture during dry spells.
The Best Way to Water Pumpkin Plants
Always water at soil level rather than over the leaves. Wet foliage can increase risk of fungal problems such as powdery mildew, particularly in warm and humid conditions
Try to maintain even soil moisture throughout the fruiting period, especially during prolonged dry spells, to support steady growth and healthy pumpkins right through to harvest.
Support Developing Fruits
As pumpkins grow larger, place them on:
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Straw
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Wooden boards
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Tiles
This improves airflow and helps prevent fruits from rotting on damp soil.
Pruning Pumpkin Plants
Pruning isn't always necessary, but it can help if you’re growing giant pumpkins. Removing unwanted side shoots and excess fruits allows the plant to focus its energy on producing fewer, larger pumpkins. Use clean, sharp pruners when making cuts to avoid damaging stems and reduce the risk of disease entering the plant.
Should You Remove Extra Fruits?
If you’re aiming for fewer but larger pumpkins, remove excess fruits so the plant can focus its energy on those remaining.
Harvesting Your Pumpkins
After months of growing and caring for your pumpkin plants, harvest time is one of the most rewarding parts of the season. Most pumpkins are ready to pick between September and October, although exact timing will depend on the variety and local growing conditions.
How To Tell When Pumpkins Are Ready To Harvest
Knowing when to harvest pumpkins is important, as picking them too early can affect their flavour, storage life and appearance.
Look for the following signs that your pumpkins are ready:
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The fruit has reached its final colour, whether orange, white, green or another variety specific shade.
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The skin feels hard and cannot easily be marked with a fingernail.
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The stem begins to dry out and toughen.
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The vine may start to die back as the growing season comes to an end.
If you’re unsure, it's usually better to wait a little longer, provided frost is not forecast.
How To Harvest Pumpkins Correctly
When harvesting pumpkins, use a sharp knife, secateurs or pruning shears to cut the fruit from the vine.
Avoid pulling or twisting pumpkins from the plant, as this can damage both the fruit and the stem. Leave a section of stem attached, ideally around 5-10cm long, as this helps improve storage life and reduces the risk of rot developing around the top of the pumpkin.
Handle harvested pumpkins carefully, particularly larger varieties, as bruising can shorten their storage life.
Curing Pumpkins for Longer Storage
If you plan to store your pumpkins for several weeks or months, curing them can help toughen the skin and improve longevity.
Place harvested pumpkins in a warm, dry and well ventilated location for around 10 to 14 days. This allows the skin to harden further and helps minor surface scratches heal naturally.
Curing is particularly useful for pumpkins intended for winter storage rather than immediate use.
What to Do With Your Harvest
Homegrown pumpkins are incredibly versatile and can be used in a variety of ways.
Popular uses include:
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Carving for halloween displays
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Roasting for soups and seasonal recipes
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Making pies, cakes and other baked treats.
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Creating autumn decorations for the home and garden
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Saving seeds for next year's growing season.
What are common pumpkin growing mistakes?
Like many vegetable crops, pumpkins can occasionally encounter pests and diseases during the growing season. Fortunately, most common problems can be prevented or managed with good garden hygiene and consistent care.
Powdery Mildew
Powdery mildew is one of the most common issues affecting pumpkin plants, particularly later in the summer when warm days are followed by cooler, damp nights. It appears as a white, powdery coating on the leaves and can reduce the plants ability to photosynthesise effectively.
To help prevent powdery mildew, ensure plants have enough space between them to encourage good airflow. Water at the base of the plant rather than wetting the foliage and remove any heavily affected leaves to slow the spread of the disease.
Slugs and Snails
Young pumpkin plants can be vulnerable to slug and snail damage, particularly in the weeks immediately after planting out. These pests can quickly chew through tender leaves and stems, slowing growth or even killing young plants.
Regularly inspect plants, especially after wet weather, and remove slugs by hand where possible. Creating barriers around young plants, encouraging natural predators such as birds and hedgehogs, or using wildlife-friendly slug control methods can also help protect your crop.
Fruit Rot
Fruit rot often occurs when developing pumpkins sit directly on damp soil for extended periods. Excess moisture can cause the underside of the fruit to soften and decay before it reaches maturity.
To prevent this, place growing pumpkins on a layer of straw, a wooden board, tile or similar dry surface. Consistent watering is also important, as periods of drought followed by heavy watering can sometimes cause fruits to split or become more susceptible to rot. Keeping the area around plants free from weeds can further improve airflow and reduce excess moisture around developing fruits.
Common Pumpkin Growing Mistakes
Even experienced gardeners can make mistakes when growing pumpkins.
Common Pumpkin Growing Mistakes include:
Planting Too Early
Cold temperatures can slow growth, stunt young plants and, in some cases, kill them altogether. Pumpkins are tender plants that thrive in warm conditions, so planting them outdoors before the risk of frost has passed can set them back. Waiting until late spring or early summer and hardening plants off properly will give them the best chance of establishing successfully.
Not Improving the Soil
Pumpkins need nutrient rich soil to thrive. Before planting, enrich the soil with plenty of compost or well-rotted manure to provide the nutrients these hungry plants need throughout the growing season. Poor soil can lead to weak growth, fewer flowers and smaller fruits, making soil preparation one of the most important steps in successful pumpkin growing.
Underwatering During Summer
Inconsistent watering can lead to poor fruit development, split fruits and reduced yields. Pumpkin plants need a steady supply of moisture throughout the growing season, particularly when flowers and fruits are forming. Allowing the soil to dry out completely between waterings can stress the plants and affect size and quality of the harvest. Aim to water deeply and consistently, especially during prolonged periods of warm dry weather.
Why not check out our guide on how to keep plants hydrated in warm weather?
Forgetting to Feed
Pumpkins are heavy feeders and quickly use up the nutrients available in the soil, particularly once they begin producing flowers and fruits. Without regular feeding, plants may develop weak growth, pale leaves and smaller pumpkins. Applying a balanced fertilisers during the early stages of growth, followed by a high-potassium feed once flowering begins, can help support healthy vines and encourage larger, better quality fruits throughout the season.
Poor pollination
Without pollination, pumpkins cannot develop properly. If there are few bees and other pollinating insects visiting your garden, female flowers may fail to set fruit and fruit and simply drop off. Encouraging pollinators with companion plants such as borage and marigolds, or hand pollinating flowers yourself can help improve fruit production and increase your harvest.
Overcrowding Plants
Lack of space can reduce airflow around the leaves and vines, creating damp conditions that encourage fungal diseases such as powdery mildew. Overcrowded plants are also competent for sunlight, water and nutrients, which can lead to weaker growth and smaller pumpkins. Always follow the recommended spacing for your chosen variety to give plants the best chance of producing a healthy crop.
Frequently Asked Questions
What Month Do You Plant Pumpkins in the UK?
Most pumpkin plants are planted outdoors from late May to early June once frost risk has passed.
How Long Do Pumpkins Last Once Picked?
When stored correctly in a cool, dry and frost free location, pumpkins can last between two and three months, sometimes longer depending on the variety.
How Long Does It Take to Grow Pumpkins?
Most varieties take between 90 and 120 days from sowing to harvest.
Can Pumpkins Grow in Pots?
Yes, pumpkin gardening in pots is possible when growing smaller varieties in large containers with regular watering and feeding.
What Should Not Be Planted Near Pumpkins?
Avoid planting pumpkins too close to potatoes, large brassicas and other vigorous squash varieties that compete for space and nutrients.
Why Are My Pumpkin Flowers Falling Off?
Male flowers naturally fall off after releasing pollen. If female flowers are dropping, poor pollination is often the cause.
How Many Pumpkins Will One Plant Produce?
Most pumpkin plants produce between two or five fruits, although this varies depending on variety and growing conditions.
With plenty of sunshine, regular watering and a little care throughout the growing season, you will be reworded with a crop of homegrown pumpkins ready for cooking, decorating or carving in autumn.