In general, an established blackberry plant doesn't need a lot of feeding or it will produce luxuriant leaves and not a lot of fruit. The most important thing is to make sure it doesn't get too dry when the fruit is swelling. If you remember childhood blackberrying expeditions, brambles will naturally produce plenty of fruit with no intervention from humans...
If it is indeed a Himalayan Giant, I hope you have appropriate clothing to wear when it needs pruning. I read somewhere that full motorcycle gear, including helmet and gauntlets, works well!
Yes it’s a Himalayan Giant. This one is already about 15ft long and this is only halfway.
“Rivers know this ... we will get there in the end.”
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Yes it’s a Himalayan Giant. This one is already about 15ft long and this is only halfway.