French Crane's-bill prefers consistently moist soil, especially during dry periods and its active growing season. Water deeply when the top few centimeters of soil feel dry to the touch, but avoid waterlogging, which can lead to root rot. Established plants show some drought tolerance but perform best with regular moisture.

Prune Geranium endressii after its main flush of flowers to encourage a second bloom and maintain a tidy appearance. Cut back spent flower stalks and any leggy or damaged foliage. A more substantial cutback in late summer or early autumn can rejuvenate the plant and prepare it for winter.

Easily propagated by division in spring or autumn. Lift the clump, separate it into smaller sections with roots attached, and replant. It can also be grown from seed, which should be sown in autumn or spring, though germination can be erratic. Cuttings are less common but possible.

For container-grown plants, repotting is typically needed every 2-3 years in spring. Choose a pot that is slightly larger than the previous one and refresh the potting mix. Ensure good drainage. For garden plants, division every few years helps maintain vigor and prevents overcrowding.