Encourage butterflies and pollinating bees by soaking the attached sponge with a sugar/honey & water mix (1:5). Ideally position in warm sheltered position next to wildlife attracting plants such as Buddleia, Hebe or Sedum. So easy to maintain. Simply remove the sponge from time to time and wash in warm water. For best results use with specialist Butterfly Attractant lotion, see in related items below.