Bamboo

Bamboo is the most common legendary seed to get from the seed shop, it will usually show up in higher quantities (usually higher than 10), The Bamboo is a 1-Harvest crop, meaning once you harvest it, it goes in your inventory and will not grow back. Bamboo is climbable, so its important to have at least few bamboo seeds in your inventory since it wont always be in the shop, as for some of your taller plants will be harder to climb. However, this strategy may not work with extremely tall overgrown plants.