How to use leftover pumpkin in your garden: 3 easy ways to re-use squashes to enrich soil

It's the season for pumpkins and funny-looking gourds, a time when many of us will be using all our elbow grease to carve masterpieces and make whimsical displays. But what happens when spooky season is over and you're left with a doorstep full of soggy squashes?

There's nothing quite like finding sustainable garden ideas that help you create less waste whilst also encouraging your garden's eco-system. Similar to the way you can use tea bags in your garden or banana peels in the garden, food waste whether you've eaten it or not is highly beneficial for soil enrichment.

So when your pumpkins, carved or not, have finished their decorative purpose don't just throw them away, try out one of these savvy ideas for using leftover pumpkins in your garden to get more out of them.

How to use leftover pumpkin in your garden: 3 easy ideas

Certain garden trends come and go over the years, but finding ways to reuse organic waste will always be in fashion. It's the same reason we continue to use orange peels in the garden and coffee grounds in the soil.

Pumpkins are no exception, in fact, they can bring so many benefits to your garden and reusing them saves filling up your bin with rotting squashes.

Chris Bonnett, Founder of GardeningExpress.co.uk says, "It’s a shame that tonnes of pumpkin leftovers go to landfill after Halloween each year when they can be put to great use in gardens."

Chris Bonnett

Chris is the founder of the online garden centre GardeningExpress and has been in the horticulture industry for over 20 years. Whilst he was young he combined his passion for the outdoors with the internet to deliver quality plants across the UK and Europe.

1. Make nutrient-rich compost

One of the simplest ways to repurpose Halloween pumpkins is to compost them," says Chris. "Pumpkins are packed with nutrients and break down quickly, making them a perfect addition to your compost pile."

Making your own compost and having a bin or walled heap is a great way of providing yourself with top-quality nutrient-rich soil whenever you need it. It's also ideal for lowering the amount of food waste you send to landfill.

If your pumpkins were used as jack-o-lanterns you'll want to remove any candle wax and chop them up into smaller pieces before throwing them into the compost pile.

2. Soil enrichment

If you're already struggling to find ways to make your small garden look bigger you may not have room for a compost heap or bin fear not, you can feed pumpkin chunks directly into the soil.

"If composting is not an option, you can also bury pumpkin pieces directly into the soil," says Chris. "Simply dig a hole, drop in the pumpkin and cover it with soil to benefit your other plants from the rich organic matter left behind."

Pumpkins are full of nitrogen, phosphorus and potassium so we'd recommend burying the chunks near your vegetables and leafy greens.

3. Seed harvesting

Whether you're into succession planting or have mastered how to collect seeds from your garden, having a stock of dried stored seeds at hand is always a good thing.

Chris recommends keeping all the seeds when you've carved your pumpkin or taking them out when repurposing the un-carved ones too.

He says, "While you’re carving pumpkins, harvest the seeds so you can use them to grow new pumpkins for the next season. Store the seeds somewhere cold and dry and save them for spring."

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Can you leave pumpkins out for animals?

While you might be working hard to keep squirrels out of your garden, there may be some wildlife you'd like to keep around. In the same way, you'd set out birdseed, you may think that chopped pumpkin is a good food offering but it's unfortunately not.

"Pumpkins are not a natural food source for most wildlife and can make animals feel unwell and spread diseases," says Andrew Ward from Arbtech. "Whilst badgers and foxes may be able to enjoy pumpkin as long as it has been cut into small pieces and safely fed to them, for hedgehogs the risks can be fatal."

“Any discarded pumpkin intended for wildlife should be cut into little pieces and left in small quantities. These should be placed on a raised platform such as a bird table so that hedgehogs are unable to access them," he adds.

The cellulose found in pumpkins can cause dehydration and diarrhea for hedgehogs so it's best to keep the chunks well away when leaving out for other animals.

Andrew also points out that you shouldn't leave your pumpkin out in public spaces too long either, especially if they've been decorated. He explains, "If the pumpkin has contained candles then they should not be left for wildlife at all as the soot and residue from the candles may be harmful. They might also ingest foreign objects like candle holders."

It's best then, to take in your pumpkin when it's served its purpose and reuse it in your garden safely for your plants to enjoy.

Just because pumpkins are out of the picture doesn't mean the cosiness of autumn is over. There are plenty of autumn decor ideas that will keep the season's joy around you without worrying about rotting vegetables.