- Species and varieties: Calendula officinalis, commonly known as pot marigold, is a species of flowering plant in the daisy family Asteraceae. It includes several varieties such as 'Pacific Beauty', 'Indian Prince', and 'Alpha'.
- Hybrid or heirloom: Calendula officinalis seeds are typically heirloom varieties, meaning they are open-pollinated and have been passed down through generations without genetic modification.
- Pruning and training: Regular deadheading of spent flowers encourages continuous blooming. Pinching back young plants can promote bushier growth. Calendula does not require extensive pruning or training.
- Fertilization needs: Calendula is a low-maintenance plant that does not require heavy fertilization. A balanced, all-purpose fertilizer applied once a month during the growing season is sufficient. Over-fertilization can lead to excessive foliage growth at the expense of flowers.
- Hardiness zones: Calendula officinalis is suitable for USDA hardiness zones 2-11.
- Climate requirements: Calendula prefers cooler climates and can tolerate light frost. It thrives in full sun to partial shade and requires well-drained soil. Ideal growing temperatures range from 60°F to 70°F (15°C to 21°C).