Tissue culture plants are grown in-vitro in a sterile lab. They are a great way to introduce plants to your aquarium without the risk of pests, algae, or pesticides that may come with aquarium plants sold by the pot or lead bunch. The trade-off is that tissue culture plants start as small plantlets and require more time to develop into a full grown plant. Each tissue culture cup contains about 5-8 plantlets (depending on the type of plant). Tissue culture plants will ensure your planted aquarium gets off to a fresh start.