I am completely smitten with this combination of snow peas and sea holly (Eryngium spp.). The silvery green, curvy foliage of the peas and their delicate, dangling pods contrasts perfectly with the spiny sea holly flowers. To steal this idea, simply plant a sea holly at the front of a pea trellis and sow peas all around. As the peas grow, they’ll use the sea holly as scaffolding to reach their trellis.