TL;DR: If a Martian Mushrooms product lets you down, we’ll replace it for free. If anything goes wrong, we make it right. For life.

There is nothing more frustrating than spending weeks nurturing a project, only for something to go wrong.

We get it. Mushroom growing has a learning curve, and sometimes, things just don't go to plan. 

Our success is our number one priority, and that’s why we’re taking all the risk off your shoulders so you can focus on the reward.

If you have an issue with any of our core growing products (at any time, for any reason) we will replace it for you, free of charge. That’s our lifetime promise to you.

What Does "Lifetime" Actually Mean?

Simple. It means the guarantee is not time-bound.

Life gets busy, and we understand if you don't reach out the moment an issue arises. 

Our guarantee doesn't have a 30-day or 60-day limit; you are covered without time restrictions.

What This Guarantee Covers

To be crystal clear, your investment is protected.

This guarantee applies to all our core mushroom growing supplies:

✅ All Grow Kits, Substrates & Grain Bags: If they contaminate, stall, or fail to perform, we'll replace them.

✅ All Genetics & Spawn: We guarantee the viability and sterility of our cultures and spawn.

✅ Wholesale & Bulk Orders: Our partnership is important to us. All our wholesale partners are fully covered by this same guarantee.

✅ Your Mistakes: Yes, you read that right. If you make a mistake during the growing process and something goes wrong, you’re still covered. We're here to support your learning journey.

Our Simple & Fair Conditions

What's the catch?

None. This guarantee is designed to be the best in the industry. We have just a few fair conditions to ensure we can help you effectively.

Q: What do I need to make a claim?

To help our team understand the issue and process your replacement quickly, we require clear evidence (photos or a video) of the problem. Please do not dispose of the product before contacting us. In some cases, we may provide a pre-paid label to have the product returned to our lab for analysis. This helps us improve our processes for everyone.

Q: What about equipment?

Products not manufactured by us, like the LabPro Laminar Flow Hoods, are not covered by the lifetime guarantee but do include a comprehensive 2-year warranty.

Q: What if I use another company's products with yours?

To ensure a controlled process, this guarantee is valid only when Martian Mushrooms growing products are used with other Martian Mushrooms growing products. Using cultures or items purchased elsewhere will invalidate the guarantee, as we cannot verify their sterility or quality.

Ready to Make a Claim?

We make it fast and hassle-free.

Click Here to Start Your Claim

Why We Offer This Unbeatable Guarantee

Simple: We believe we make the most reliable mushroom growing supplies in the UK.

We are fanatical about our sterile processes so you don't have to be.

This guarantee is our public commitment to you, holding us accountable for maintaining the absolute highest standards.

It also ensures that if you mess up, you are not left out of pocket and left out to dry.

When you buy from Martian, you buy with complete confidence.