The following is an account of my first and so far only foray into #GuerillaGardening.
Back a couple of years before Lockdown I was out collecting flies alongside the river Thames near Reading when it started to rain and, as I had forgotten to bring my umbrella with me, I went to shelter under a nearby tree. While waiting for the rain to pass I looked up and discovered that the tree was heavy with unripe walnuts. I made a mental note to revisit the tree later in the year when the walnuts would be ripe. Over the following two years I collected several carrier bag loads of walnuts from that tree, easily £100 worth at shop prices, and they were perfectly good to eat. Then just before Lockdown some contractors putting in underground electricity cables cut two large branches off the tree. This annoyed me intensely and I determined to somehow restore my supply of walnuts.
I went online and ordered 12 walnut tree saplings and a foldable spade. I also bought bamboo canes and helical plastic stem protectors. Then, during the first November of Lockdown, I discreetly planted these saplings at various fairly obscure locations around Reading. Over the next two years I regularly tended the saplings, feeding them during the spring and watering and mulching them during the drier parts of the summer.
Two died within a year when their leaves were all eaten, probably by a muntjac deer. Two more lived for a few years but never had more than half a dozen leaves, probably because I had planted them in acid soil. But the other eight are all now taller than me and each year sprout lots of large healthy looking leaves. And I am looking forward to my first crop of walnuts from them within the next five to ten years.