Soldier butterflies are a bit pickier about host plants than Monarch and Queen butterflies. Their favorite host plant in south Florida is White Vine, also called White Twinevine, Funastrum clausum.
White Twinevine is in the milkweed family, full of white sap. In this vine, the sap is excessively sticky, unlike most milkweeds.
Light: Full sun to partial shade
Soil: Average to rich
Soil: Average to moist
Height: Aggressive vine grows to top of pole, tree, or trellis to 14′ and more
Propagation: Seed and stem cuttings
Host: Solder, Queen, Monarch