Calendula Seeds
When should I plant
Calendula seeds can be planted in either spring or fall, depending on the climate. In cooler regions, sow seeds after the last frost in spring for summer blooms. In milder climates, fall planting allows for early spring flowers, as the seeds can overwinter and germinate when temperatures rise.
Spring Sowing
For spring planting, sow calendula seeds outdoors once the soil has warmed and there’s no risk of hard frost. Seeds germinate best in cool but not freezing conditions, and plants will bloom from early summer until frost.
Fall Sowing
In regions with mild winters, plant calendula seeds in late fall. The seeds remain dormant over winter and sprout in early spring, providing earlier blooms. In colder zones, fall sowing may require protection or indoor starting.
Site consideration
Calendula thrives in well-draining soil with moderate fertility. Avoid waterlogged areas, as this can cause root rot. These flowers adapt to various soil types, including sandy or loamy soils, but prefer a slightly acidic to neutral pH (6.0–7.0).
Water
Keep the soil consistently moist but not soggy during germination and early growth. Once established, calendula is somewhat drought-tolerant but benefits from weekly watering during dry spells. Overwatering can lead to fungal diseases.
Sunlight
Calendula prefers full sun (6+ hours daily) but tolerates partial shade, especially in hot climates. In warmer regions, afternoon shade helps prolong blooming and prevents wilting.
Seed Germination
Seeds typically germinate in 5-15 days at temperatures between 60–70°F. Light aids germination, so cover seeds lightly with soil (¼ inch deep) or press them into the surface. Keep the soil moist until seedlings emerge. Thin seedlings to 8-12 inches apart. For mass planting, scatter seeds and lightly rake them in, then thin as needed.
Seeding Rate
1 ounce covers 100 sq.ft.
Other Elements
Fertilization
Calendula doesn’t require heavy feeding. A light application of balanced, organic fertilizer (like compost or a 10-10-10 mix) at planting supports growth. Avoid high-nitrogen fertilizers, which promote foliage over flowers.
Weed control
Mulching around plants helps suppress weeds and retain moisture. Hand-pull weeds near calendula to avoid damaging shallow roots.
Seed Storage
The seeds will maintain a high germination percentage if stored under proper conditions. How long your seeds remain viable will depend on the temperature and moisture levels the seeds are exposed to. Seeds which are improperly stored will quickly deteriorate if unprotected against high humidity and dramatic temperature fluctuations day after day.
For best results, keep the seed in our moisture-proof ziplock sealing bags, which provide a better moisture prevention effect. Glass jar or plastic containers with snap-on lids works well too, add a packet of desiccant before sealing into the seed, such as silica gel to remove any moisture remains in the storage container. Seed stored under these conditions will remain viable for as long as years.
Factors Which commonly Cause Poor Results
1. Improper drainage soil
2. Sowing depth more than one inch
3. Covering the seed too deep beneath the soil surface
4. Cover a large area with a small amount of seed.
5. Plant at a wrong time of a year
6. Lack of sunlight
7. Inadequate rainfall after seed germination. The area should not be allowed to become completely dry. Supplemental watering may be required to sustain plant life.
8. Extreme weather conditions: hail, drought, excessive rainfall, floods, unseasonably cold temperatures.