Water mat amaranth regularly, especially during dry periods, to maintain consistently moist soil. Allow the top inch of soil to dry slightly between waterings. Avoid waterlogging, as this can lead to root rot.

Reduce watering in cooler months when growth slows.

Pruning is generally not necessary for mat amaranth. If the plant becomes too sprawling or leggy, you can lightly trim it back to encourage bushier growth.

Remove any dead or damaged foliage to maintain a tidy appearance and improve air circulation.

Mat amaranth is easily propagated by seeds sown directly in the garden after the last frost. Seeds can also be started indoors a few weeks before the last frost and transplanted.

It readily self-seeds, often naturalizing in suitable conditions.

Repotting is typically not required for mat amaranth, as it is often grown as an annual or allowed to self-seed. If grown in containers and it becomes root-bound, repot in spring to a slightly larger container with fresh, well-draining potting mix.