Citrus cuttings should fruit within about 3 years, grown from seed can take 10 years or more to bear fruit. That said, I planted some seeds from a supermarket pink grapefruit in January and a couple of them are showing buds which look as if they could be ready to flower. So, in short I don't know
Blackberries don't like it too wet and some of the best crops of wild berries I have tasted have been on beach sand dunes within a peble throw of high tide. They are a coloniser of bare ground and as such will tollerate and thrive in poor soil and full sun so you may be killing them with kindness if you are mulching with over-rich manure.