Protect your garden for the summer

This is the time of year to keep an eye on invasive species, writes Ros Drinkwater

Ask me my favourite time of year, and I'll probably say the night the clocks go forward, because the whole summer lies ahead. Right now, my patch is in overture and beginners' mode for variations on the theme of “everything earlier than usual'‘.

I picked the first tarragon on March 3 which, in this neck of the woods, has to be a record. Incidentally, I tried freezing tarragon last year, but I would ...