Calendula problems

Calendula officinalis is called pot marigold, but it is different from Tagetes marigolds. Check the botanical name because their care and edible use are not interchangeable.

It is usually grown as an annual, though it may act as a short-lived biennial in mild climates. It can also self-sow if some seed heads mature.

Full sun encourages flowering, and calendula also tolerates partial shade. In hot regions, light afternoon shade can help it through warmer weather.

Wisconsin Extension describes Calendula officinalis petals and leaves as edible. Confirm the plant identity and use flowers that have not been treated with pesticides; do not confuse it with another plant sold as a marigold.

Calendula is adapted to cool-season growing and may languish during prolonged heat. Grow it in the cooler part of the year, keep the soil draining well, and allow it to resume when conditions cool.

Keep seedlings and newly planted calendula evenly moist while they establish. For established plants, water when the upper inch of soil begins to dry, then let excess drain away. The plant prefers moderate moisture and well-drained soil; do not leave a container standing in water. In practice, water check the soil instead of following a fixed calendar. Containers and plants growing in windy, dry weather may need more frequent checks than an in-ground bed. Water the root zone when the surface layer has started to dry. Feel the top inch of soil. If it is still damp, wait and check again; if it has begun to dry, water thoroughly and allow the pot or bed to drain. Calendula is a cool-season flower. Check containers more often during dry spells, but do not try to compensate for hot-weather stress by keeping the roots constantly wet. In warm climates, grow it in the cooler season and give it light afternoon shade when summer heat arrives.

Calendula grows best in full sun for the most flowers. It also tolerates Partial shade, Bright afternoon shade in hot-summer climates. Avoid deep shade and prolonged hot weather.