Growing rhubarb from seed can be a rewarding experience, but it does require some patience and attention to detail. While it may not be the easiest plant to start from seed, with the right care and conditions, you can have success in growing your own rhubarb plants.
When starting rhubarb seeds, it’s important to keep in mind that rhubarb is a cool-weather crop. This means that it thrives in cooler climates and prefers temperatures below 75°F (24°C). If you live in a climate zone 6 or cooler, rhubarb is an ideal choice for your garden.
To start rhubarb seeds, you’ll want to begin in early spring, around 8-10 weeks before your last frost date. This will give the seeds enough time to germinate and establish before being transplanted outdoors.
Here are some steps to follow when starting rhubarb seeds:
1. Choose a good quality seed starting mix: Look for a well-draining mix that is light and fluffy. Avoid using regular garden soil, as it can be too heavy and may not provide the best conditions for germination.
2. Sow the seeds: Fill seed trays or pots with the seed starting mix and lightly press the seeds into the surface. It’s important not to bury the seeds too deeply, as they require light to germinate. Aim for a depth of about 1/4 inch (6mm).
3. Keep the soil moist: Rhubarb seeds require consistent moisture for germination. Water the seeds gently but thoroughly, making sure the soil remains moist but not waterlogged. Using a spray bottle or mister can help prevent overwatering.
4. Provide adequate light: Place the seed trays or pots in a location that receives bright, indirect light. If you don’t have access to natural light, using fluorescent lights or grow lights can be a good alternative. Keep the lights on for 12-14 hours a day to promote healthy seedling growth.
5. Maintain optimal temperatures: Rhubarb seeds germinate best in temperatures between 60-70°F (15-21°C). You can use a seedling heat mat to provide bottom heat if necessary. Once the seeds have germinated, you can lower the temperature slightly to encourage sturdy growth.
6. Thin out seedlings: Once the seedlings have grown their first true leaves, you’ll need to thin them out to give each plant enough space to grow. Choose the strongest and healthiest seedlings and carefully remove the weaker ones, leaving about 2-3 inches (5-8cm) between each plant.
7. Harden off the seedlings: About a week before transplanting the seedlings outdoors, you’ll need to gradually expose them to the outdoor conditions. Start by placing them outside for a few hours each day, gradually increasing the time and exposure to direct sunlight. This process, known as hardening off, helps the seedlings adjust to the outdoor environment.
8. Transplanting outdoors: Once the danger of frost has passed and the seedlings are around 6-8 inches (15-20cm) tall, they can be transplanted into the garden. Choose a location that receives full sun or partial shade, with well-draining soil. Space the plants about 3-4 feet (90-120cm) apart to allow for their mature size.
9. Provide ongoing care: Water the plants regularly, especially during dry spells, to keep the soil consistently moist. Mulching around the plants can help retain moisture and suppress weed growth. Fertilize with a balanced organic fertilizer in early spring and again in late summer.
It’s important to note that growing rhubarb from seed can take a few years before you can start harvesting stalks. Rhubarb plants are typically not harvested in their first year to allow the plants to establish a strong root system. In subsequent years, you can begin to harvest stalks in the late spring or early summer, but remember to leave at least a third of the stalks on the plant to ensure its continued growth.
While growing rhubarb from seed may take some time and patience, it can be a rewarding experience. By following the steps outlined above and providing the right conditions, you can successfully grow your own rhubarb plants and enjoy their delicious stalks for years to come.
