Some plants produce seeds that are not suitable for seed-banking; other plants do not produce seed at all. An alternative way to conserve these species is to culture and bank their tissues.
Tissue culture involves taking very small pieces of plant (buds, shoot tips, or other parts) and growing them on special nutrient media in sterile conditions. This method allows the production of many plants from a single shoot — a great advantage when plants are rare. Many house and garden plants available in nurseries are grown by tissue culture.