This may not be at all stores - butdefinately was at the new massive store open in Bradley Stoke - Bristol.
these appeared to be clearance items, but there were quite a few:
1Litre bottle of Miracle Grow - 11p (Was Over £1.50) - around 20bottles remaining
Gardening Gloves - were £1.00, now £0.25
Gerdening String - Was £1.00 - now 25p.
there were other products (not all were gardening) which were reduced - i only passed quickly, but some bargains definitely to be had.]
Can't see this online - so may only be store-specific