Yellow jessamine (Gelsemium sempervirens) became our official state flower in March 14,1924. Because it is native to our state, it is also called Carolina jessamine. Other names include trumpet vine, evening trumpet flower, and both yellow jasmine and Carolina Jasmine. (Jessamine and jasmine are two variations of the same word, and both are acceptable and accurate names for this plant. Here we refer to it as jessamine since that is how it is spelled in Joint Resolution No. 534, which established the flower as an emblem of South Carolina nearly a century ago.)

Jessamine is an evergreen vine that climbs trees, fences, and latticework all over our state. It blooms in very late winter or early spring, offering the first hope of warm weather to come! This flower loves sun and can grow quite fast given plenty of space and moist, well-drained soil.

https://www.sciway.net/facts/sc-state-flower-yellow-jessamine.html