Perched atop our brick pile is this healthy group of Herb Robert, Geranium robertianum, covered in a confetti of small pink flowers, busy with bees and pretty as anything. Rooted into little more than woodlouse poop, it shows just how tough and adaptable this native annual is. Growing in sun, shade, damp or dry, it will spring up wherever it can get a foothold. Ferociously fecund, each plant will produce countless seeds, flinging them far and wide. For some it's a frustrating weed. Here, in the main, it gently jostles for space, moving round the garden as it constantly claims new ground - lots get tugged out and fed to the compost heap. Annual it may be but it is a perennial presence in the garden - just as well we like it so much.