Keep soil consistently moist but not waterlogged, especially during active growth and flowering. Allow the top few centimeters of soil to dry out slightly between waterings. Reduce frequency in cooler weather or if grown as a perennial in dormancy. Overwatering can lead to root rot, while underwatering causes wilting.

Regular deadheading of spent flowers is essential to encourage continuous blooming and prevent the plant from diverting energy into seed production. Lightly prune throughout the growing season to maintain a compact, bushy shape and promote new growth. For older, established plants, a more significant cut back by one-third to one-half in late winter or early spring can rejuvenate them, leading to stronger growth and more prolific flowering.

Argyranthemum frutescens is readily propagated from softwood cuttings taken in spring or semi-ripe cuttings during summer. Select healthy, non-flowering stems about 10-15 cm long. Remove the lower leaves, dip the cut end in rooting hormone, and insert into a moist, well-draining potting mix. Provide warmth and consistent humidity, perhaps under a propagator or plastic cover, until roots develop, typically within a few weeks.

Young Marguerite Daisies grown in containers generally benefit from annual repotting into a slightly larger pot with fresh, well-draining potting mix. This provides new nutrients and space for root expansion. For older, perennial specimens, repotting every 2-3 years or when they become visibly root-bound is sufficient. Always ensure the new pot has adequate drainage holes and maintain the original soil level around the plant's base.