Seed can be collected as soon as the pods begin to turn a dark brown. To prevent destruction of the seed, simply place the pods into an airtight bag to which a mothball has been added. After two days, remove the pods and collect the seed as usual. Cuttings root readily in sand with gentle bottom heat. Blue Butterfly vines do best when sited in good sandy loam in full sun.
Plants are very drought resistant once established, and are tolerant of coastal conditions.
Vines look very nice when offset by Texas sage, Salvia greggi. Both thrive in our heat and humidity. Another indispensable provider of electric blue flowers is found in Salvia sinaloensis. A low-growing herbaceous perennial harking from the Mexican province of Sinaloa, it was first introduced to American gardeners in the mid 1980's by the Huntington Botanical Gardens in California. Growing under 1 foot tall, this delightful dwarf sports whorls of cobalt-blue flowers from April through September.