These plastic labels are most useful to identify bonsai trees, cuttings, seedling or yamadori bonsai trees. You can use a permanent marker to record species name, planting dates and other important information which may otherwise get lost.
To use, record the required information on your label and push the label in the soil in the bonsai pot. The plastic spike makes insertion into the growing medium very easy.
The labels are manufactured from plastic which will withstand the strong sun and its UV rays, here in South Africa.