You Asked, So We Listened! 5L Worm Cast Bags Now Available

Since we launched, the demand for our 1 and 2.5-litre revolutionary pure worm cast pouches has been so high that we knew we needed to offer bigger, better-value bags. We’re pleased to announce that you can now buy our pure worm casts in 5-litre bags!

At Gro Worm, we’re passionate about making sustainable, high-quality growing mediums accessible to gardeners of all levels, and our pure worm casts are designed to do just that. Sourced from worms fed a nutrient-rich organic diet, our pure worm cast product is created with the same care and attention that’s gone into every size we offer – now just in a more generous 5-litre bag. 

Whether you're nurturing houseplants, feeding vegetable patches or conditioning soil, this larger size brings extra value and convenience, helping you grow more sustainably.

Why choose pure worm casts?

Our pure worm casts are packed with natural nutrients and beneficial microbes that plants need to thrive. Unlike synthetic fertilisers, which can disrupt soil health over time, worm casts offer a gentle, natural boost, improving everything from seed germination to root development. In fact, our studies have resulted in 8 times better yields. This makes them the perfect choice for environmentally-conscious gardeners who want exceptional results without compromising their soil’s long-term health.

What sets our worm casts apart is the quality of the nutrients they provide, making them highly effective for a wide range of plants, whether in containers, raised beds, or open ground. 

The rich, dark castings are known as ‘black gold’ in the gardening world for a reason: they support strong, healthy plants, improve moisture retention, and enhance the soil's ability to absorb essential nutrients. That’s why we created Black Gold Organic compost too!

Benefits of the 5L worm cast bag

Our new 5-litre bags provide the same high-quality worm cast material as our smaller sizes, with even more benefits for you and your garden:

• Ideal for bigger projects: If you’re working on larger projects or want to stock up for the season, the 5-litre bag means you won’t run out quickly
• Better value: Buying in bulk is more economical, and our larger size provides a cost-effective option for gardeners looking to get the most out of their growing medium. Save up to 54% per litre by buying the 5-litre bag
• Versatile application: Perfect for everything from enhancing compost and potting soil to being used directly in beds and planters, our worm casts can handle it all

A step towards sustainable gardening

Gro Worm's mission is to make sustainable gardening a reality for everyone. By using natural by-products of worms, our growing mediums support soil health, reduce reliance on synthetic additives and make gardening more eco-friendly. Choosing our worm casts is a step towards sustainable, low-impact gardening that’s kind to the environment and gives back to the soil.

How to use 5L worm casts for best results

Our 5-litre bags offer plenty of flexibility, making it easy to incorporate worm casts into your routine. Here are some ways to make the most of your new supply:

• Top dressing: Sprinkle a thin layer on the surface of soil around established plants to boost nutrient availability.
• Potting mix enhancer: Blend worm casts into your potting mix to create a nutrient-rich base for seedlings and young plants.
• Compost booster: Add worm casts to your compost heap to improve the microbial balance, supporting faster and more effective composting.
• Worm tea: Add a handful of pure worm casts to a watering can filled with water and let it steep for 24 hours. Once brewed, use the nutrient-rich tea to water your plants

Ready to grow bigger and better?

Our new 5-litre bags of pure worm casts are available now, and we’re thrilled to offer this larger option. We can’t wait to see the results you achieve with our biggest bag yet, and we’re confident it will make a difference in your garden and houseplants.

Order your 5-litre bag now and join the growing number of gardeners who are choosing Gro Worm for a healthier, more sustainable gardening experience.