Some gardeners are a little afraid of plants that arrive unexpectedly. But you can always just dig them up or pull them out, transplant them elsewhere or give them to friends and neighbours. It pays to be able to identify the tiny seedlings from weeds - take a look at our weed seedling identifier.
No soil preparation is involved, and no cultivation necessary. Stepping in to cull or move seedlings when there are too many competing for the same resources may at times be necessary, but apart from that, all you need to do is sit back and watch nature takes its course.
If you favour a more laid-back approach to gardening, then self-seeders are for you. Discover eight plants that self-seed, below.
Happy in woodland conditions, these yellow or orange-flowered Welsh poppies are annuals that don't mind shade, making them perfect to weave under trees and taller shrubs, where they will provide a splash of bright colour in spring. Take a look at these 10 plants to grow under trees.
A cottage garden favourite, our native meadow cranesbill is a perennial that flowers in June and grows well in an open spot. It often puts itself among other perennials in borders. Though our indigenous plant has blue flowers, self-seeders can also be pink, mauve or white. Discover 10 hardy geraniums to grow.
Stipa tenuissima (often sold as Nasella tenuissima) produces abundant feathery panicles in summer. For a naturalistic effect, plant it among with perennials near the front of a border. It self-seeds readily - look out for little tufts around your garden. Discover five beautiful combinations of grasses and flowers.