Sweet Peas have two leaves and two tendrils, the tendrils cling and assist vines as they climb. Non-tendril Sweet Peas’ tendrils develop into true leaves.
These plants have four leaves per stem and shorter vines.
Non-tendril Sweet Pea plants cannot anchor themselves securely,
so the plants need to be secured in place with twine as they grow.
For this reason they are best grown as a ground cover or in a pot to create a "waterfall" effect.