Cuphea Plant Seeds:
Guide to Storing, Sowing and Germination

Cuphea plants are known for their showy tubular flowers that bloom in shades of pink, purple, and red. These plants are relatively easy to grow and care for, and they make great additions to gardens and container plantings alike. If you’re interested in growing Cuphea plants from seed, here’s what you need to know about storing, sowing, and germinating the seeds.

Storing Cuphea Seeds

If you’ve purchased Cuphea seeds or harvested them from your own plants, it’s important to store them properly to maintain their viability. Cuphea seeds can be stored in a cool, dry place for up to three years. It’s best to keep them in an airtight container to prevent moisture from getting in and causing the seeds to mold or rot.

Sowing Cuphea Seeds

Cuphea seeds can be sown indoors or outdoors, depending on your preference and climate. If you live in a warm climate with a long growing season, you can sow the seeds directly in the garden after all danger of frost has passed. Otherwise, it’s best to start the seeds indoors about six weeks before your last expected frost date.

To sow Cuphea seeds indoors, fill a seed tray or small pots with a well-draining potting mix. Moisten the soil lightly and sprinkle the seeds on top. Cover the seeds with a thin layer of soil and mist lightly with water. Place the tray or pots in a warm, bright location but out of direct sunlight.

Germinating Cuphea Seeds

Cuphea seeds should germinate within 7-14 days if kept in ideal conditions. Keep the soil moist but not waterlogged and maintain a temperature of 70-75°F (21-24°C). Once the seedlings have emerged, thin them out if necessary to prevent overcrowding.

Caring for Cuphea Seedlings

Cuphea seedlings should be kept in a bright location with at least six hours of sunlight per day. Water them regularly to keep the soil moist but not waterlogged, and fertilize them once a month with a balanced fertilizer.

Once the danger of frost has passed and the seedlings are large enough to handle, they can be transplanted into the garden or larger pots. Harden off the plants by gradually introducing them to outdoor conditions over the course of a week before transplanting.

FAQ

When is the best time to sow Cuphea seeds?

Cuphea seeds can be sown indoors six weeks before the last expected frost date or directly in the garden after all danger of frost has passed.

How deep should I sow Cuphea seeds?

Cuphea seeds should be sown on the surface of the soil or covered with a thin layer of soil no more than 1/8 inch (3mm) deep.

How often should I water Cuphea seedlings?

Cuphea seedlings should be watered regularly to keep the soil moist but not waterlogged. How often you water will depend on the temperature, humidity, and soil type, but as a general rule, aim to keep the soil moist.

Do Cuphea plants need full sun?

Cuphea plants prefer full sun but can tolerate some shade. Aim to give them at least six hours of sunlight per day.

How long does it take for Cuphea seeds to germinate?

Cuphea seeds should germinate within 7-14 days if kept in ideal conditions of 70-75°F (21-24°C) and moist soil.