Gelsemium 'Margarita'=-‘Margarita’ Carolina Jessamine (Gelsemium sempervirens) will find its way into your heart with golden yellow, sweetly fragrant trumpet flowers that bloom from spring to early summer. Climbing up to 12 feet, this tidy semi-evergreen vine is perfect near an entrance, or trailing along a fence or trellis where you and the hummingbirds can enjoy it. In Ohio, we suggest it be used as an annual.