How to fertilise pumpkins for big harvests

Fertilising Pumpkins for Bumper Harvests!

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Pumpkins are an autumn staple; many enjoy growing them in gardens and allotments. However, growing pumpkins can be challenging (particularly in the UK), requiring proper care and attention to produce a big harvest.

Fertilising pumpkins is crucial to ensure a healthy plant and a successful harvest. Pumpkins require many nutrients to grow, and fertilisers provide these nutrients to the plant.

Proper fertilisation can increase the yield of pumpkins and improve their quality, resulting in huge harvests. However, knowing how and when to fertilise pumpkins is essential to achieve the best results.

What We Are All Aiming For!
What We Are All Aiming For!

Understanding Pumpkin Nutrition

When it comes to growing pumpkins, understanding the plant’s nutritional needs is crucial for a successful harvest. Pumpkins require a balanced supply of nutrients, including nitrogen, phosphorus, and potassium, to grow healthy and produce large fruit.

The Importance of Nutrients

Nutrients play a vital role in every aspect of plant growth and development. They are essential for the production of chlorophyll, which is necessary for photosynthesis, the process by which plants convert sunlight into carbohydrates.

Without adequate nutrients, plants cannot produce enough energy to grow and produce fruit.

The Role of Nitrogen, Phosphorus, and Potassium

Nitrogen is essential for the production of chlorophyll and the growth of leaves and stems. It is necessary to form amino acids, which are the building blocks of proteins.

Phosphorus is critical for root development, flower formation, and fruit production. It is also essential for producing ATP, the energy molecule that drives cellular processes.

Potassium is necessary for the regulation of water balance in the plant and the formation of carbohydrates.

To provide pumpkins with the nutrients they need, it is essential to fertilise the soil appropriately. Nitrogen-heavy fertilizers should be applied early in the growing season to promote leaves and stem growth.

Nitrogen Promotes Leafy Green Growth
Nitrogen Promotes Leafy Green Growth

Once the plant begins to flower, it needs more phosphorus to produce large fruit. Potassium is necessary throughout the growing season to regulate water balance and carbohydrate production.

Preparing the Soil for Pumpkins

Getting your soil ready before planting your pumpkins is one of the best ways you can get ahead of the game and get some fertiliser right to the roots of your plant.

Organic Fertilizers and Compost

Organic fertilizers are a great way to add nutrients to the soil without the use of synthetic chemicals. They are slow-release and provide a steady supply of nutrients to the plants.

Compost is a great source of organic matter and can be made from kitchen scraps, garden waste, and other organic materials. It can be added to the soil before planting or used as a top dressing during the growing season.

I like adding lots of fresh compost to all of my garden beds, but if you don’t have enough for this, you can target it at your plants.

Add lots of compost to the planting hole before planting your pumpkins. This way, all of the nutrition and goodness from the compost is right where the plant can access it immediately.


Manure is a great source of nitrogen, phosphorus, and potassium, which are essential nutrients for pumpkin growth. However, it should be well-rotted before use to avoid burning the plants.

Manure is high in nitrogen and should be used early in the season to promote leafy green growth. If you don’t have easy access to manure, then I highly recommend getting yourself a bag of 6X Chicken manure, that stuff is brilliant, and I use it regularly!

Pumpkins are heavy feeders and require a lot of nutrients to produce large fruits. By preparing the soil with organic matter and fertilisers, you can get your plants off to the best possible start.

Planting and Growing Pumpkins

Selecting the Right Seed and Pumpkin Variety

When it comes to growing pumpkins, selecting the right seed and pumpkin variety is crucial. Some popular pumpkin varieties include Casper, Jack of All Trades, Rouge Vif d’Etampes, Aladdin, Early Giant, and big max. It is important to choose a variety that is well-suited to your climate and growing conditions.

I am growing big max this year, hoping to get some carving pumpkins for my little girl come Halloween time.

One of my pumpkin seedlings
One of my pumpkin seedlings

Transplanting and Watering

Pumpkins thrive in warm soil, so it is best to wait until the soil has warmed up before transplanting them.

When transplanting, make sure to plant the seedlings in well-draining soil that receives plenty of sunlight. Water deeply and regularly, ensuring the soil is moist but not waterlogged.

I start my pumpkins indoors in April and May; I stagger the sowing to increase my chances of having some pumpkins ready for Halloween.

I then pot them on and move them into the greenhouse when they have true leaves like the photo above. I don’t put them out into the garden until June.

Pruning and Training Vines

Pumpkin vines can quickly take over your garden if left unchecked. To keep them under control, it is important to prune and train them regularly

. Remove any side shoots that develop along the main vine, and redirect the vine as needed to prevent it from growing in unwanted directions.

I like to grow my pumpkins along the perimeter of my allotment plot along the fences. This way they can sprawl but not get in the way or take over beds.

My Fertilising Routine

Early on, I will fertilise by adding some 6X Chicken manure to the pumpkin planting hole. This gets it off to a really strong start.

Then when the plant starts flowering, I swap over to an Organic Tomato Feed. Tomato feeds are high in potassium and encourage fruit growth over foliage.

Pumpkin Patch
Pumpkin Patch

Harvesting and Caring for Pumpkins

Signs of Maturity and Harvesting

Harvesting pumpkins at the right time is crucial for optimal yield. The best way to determine whether a pumpkin is mature is by checking its skin.

A mature pumpkin will have a hard, deep-coloured skin that is resistant to scratches. Additionally, the stem should be dry and woody, and the tendrils near the stem should be brown and withered.

To harvest the pumpkin, use a sharp knife or pruning shears to cut the stem about 2-3 inches above the pumpkin. Be careful not to damage the stem or the pumpkin itself.

After harvesting, the pumpkin should be placed in a dry, well-ventilated area for curing. Curing helps to harden the skin and prolong the storage life of the pumpkin.

Preventing Diseases

Pumpkins are susceptible to several diseases and pests that can affect their growth and yield.

It is essential to practice good garden hygiene to prevent diseases, such as regularly removing plant debris and weeds.

Additionally, using disease-resistant varieties and rotating crops can help reduce disease risk.

Caring for Leaves and Blossoms

Healthy leaves and blossoms are essential for the growth and yield of pumpkins. To promote healthy growth, removing the first few female flowers is recommended to encourage more leaf growth.

Storing Pumpkins

After curing, pumpkins should be stored in a cool, dry place with good ventilation. Avoid storing pumpkins near fruits that release ethylene gas, such as apples and pears, as this can cause premature ripening and spoilage.

Regularly check stored pumpkins for signs of spoilage, such as soft spots or mould, and remove any affected pumpkins immediately to prevent further damage. Stored pumpkins can last for several months if stored properly.

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