We make about 2000 different products with each their own soil/substrate combination.
Our product development is aimed that each product can we kept for at least one year after production. But even on that there are a few exceptions.
For some products we have data that they can be stored for more than 10 years and still give the same results. Because we want to deliver good quality products, but also prevent waste and thus save costs, we have a strict QC system in our company.
We re-check all products if they are in our inventory for 6 months. If that is still OK, they can still be considered to be valid for 1 year after that. Since materials are thus maximum 6 months in our stock after production or re-check, you can use them for at least 6 months after you receive them.
If you have an older product batch in stock, you can always ask us if we have re-checked that in the meantime.