Water Rankin's Trumpetflower regularly, especially during dry periods, to keep the soil consistently moist but not waterlogged. Allow the top few centimeters of soil to dry out between waterings.

Reduce watering in winter when the plant is less active.

Prune Rankin's Trumpetflower after flowering to maintain its shape and size, or to remove any dead, damaged, or crossing branches. Light pruning can be done in late winter or early spring before new growth begins to encourage bushier growth.

Propagate Rankin's Trumpetflower by taking semi-hardwood cuttings in mid-summer. Dip the cuttings in rooting hormone and plant them in a well-draining potting mix.

Keep them consistently moist and in a warm location with good humidity until roots form.

Repot Rankin's Trumpetflower every 2-3 years or when it becomes root-bound. Use a well-draining potting mix, preferably containing some compost. Repot in early spring before new growth starts.

Ensure the new pot is only slightly larger than the previous one.