“I have a small number of pots on some saucers which are full of water. I can’t tell you the number of birds that have visited my balcony in the last week for water. “It’s very industrial where I am and the number of hoverflies and insects that are passing through, even with just a small handful of pots on a very small balcony in Tottenham, is quite remarkable.” It might be a crab apple or a cherry tree, and you’ll find masses of pollinators around them in early spring.” Create interest with underplantingA small trained tree with underplanted tulips (Alamy Stock Photo)Underplant an evergreen tree with colourful annuals thinking about what will fill that gap for about three months.