Rhubarb Seeds: How to Grow Rhubarb from Seed to Harvest

Introduction

Growing rhubarb from seeds is an excellent way to cultivate this hardy perennial from scratch. While most gardeners opt for crowns or potted plants, starting rhubarb from seeds allows you to experiment with unique varieties and enjoy the rewarding process of nurturing a plant from its earliest stage. Although growing rhubarb from seeds takes more time to establish, the long-term benefits and satisfaction make it a worthwhile endeavor.

This guide will take you through everything you need to know about rhubarb seeds, from sowing and transplanting to caring for and harvesting your plants.

Why Grow Rhubarb from Seeds?

Cost-Effective: Rhubarb seeds are much cheaper than buying crowns or potted plants.
Variety Options: Seeds give access to unique and rare varieties of rhubarb.
Disease-Free Start: Growing from seeds minimizes the risk of introducing diseases.
Scalability: A single seed packet can yield multiple plants.
Rewarding Process: Enjoy the full journey from seed to harvest.

Best Rhubarb Varieties to Grow from Seeds

1. Victoria

Description: A traditional, heavy-cropping variety with greenish-red stalks.
Best For: Reliable yields and tart flavor.

2. Glaskins Perpetual

Description: Produces sweet stalks, even late in the season.
Best For: Extended harvest periods.

3. Raspberry Red

Description: Known for its bright red stalks and sweet flavor.
Best For: Desserts and preserves.

4. Timperley Early

Description: An early-maturing variety with tender stalks.
Best For: Early spring harvesting.

When to Sow Rhubarb Seeds

1. Indoors

Sow rhubarb seeds indoors in late winter or early spring, 8-10 weeks before the last frost.

2. Outdoors

Sow seeds directly in the garden after the last frost in late spring or early summer.

Preparing Rhubarb Seeds

1. Seed Selection

Purchase high-quality rhubarb seeds from a reputable supplier to ensure good germination rates.

2. Soaking Seeds

Soak the seeds in lukewarm water for 2-3 hours before sowing.
This helps soften the seed coat and improves germination.

Sowing Rhubarb Seeds

1. Sowing Indoors

Fill seed trays or small pots with a light, well-draining seed-starting mix.
Sow seeds 1cm deep and cover lightly with soil.
Water gently to moisten the soil.
Place trays in a warm location (18-21°C or 65-70°F) with plenty of light.
Keep the soil consistently moist but not waterlogged.

2. Sowing Outdoors

Prepare the soil by loosening it and removing any weeds.
Sow seeds 1cm deep, spaced 6 inches apart in rows.
Water lightly and keep the soil moist.

Germinating Rhubarb Seeds

Rhubarb seeds typically germinate within 10-20 days under ideal conditions.
Thin out seedlings once they develop their first true leaves, leaving the strongest plants.

Transplanting Rhubarb Seedlings

1. When to Transplant

Transplant seedlings when they are 10-15cm tall and after the last frost.

2. Preparing the Site

Choose a sunny or partially shaded location with rich, well-draining soil.
Amend the soil with compost or well-rotted manure before planting.

3. How to Transplant

Dig a hole large enough to accommodate the seedling’s roots.
Place the seedling in the hole, ensuring the crown is level with the soil surface.
Space seedlings 3-4 feet apart to allow room for growth.
Water thoroughly after transplanting.

Caring for Rhubarb Grown from Seeds

1. Watering

Keep the soil consistently moist, especially during the first year.
Avoid overwatering to prevent waterlogging.

2. Feeding

Apply a balanced fertilizer in early spring to encourage healthy growth.
Mulch with organic matter like compost or straw to provide nutrients and retain moisture.

3. Pruning and Maintenance

Remove any flower stalks as soon as they appear to focus energy on growing edible stalks.
Trim yellowing or dead leaves to improve airflow and reduce disease risk.

4. Overwintering

In late autumn, cut back foliage and mulch the crown to protect it from frost.

Harvesting Rhubarb

1. When to Harvest

Avoid harvesting rhubarb in its first year to allow the plant to establish.
Begin harvesting in the second year, from mid-spring to late summer.

2. How to Harvest

Hold the stalk near the base and gently twist and pull.
Alternatively, use a sharp knife to cut the stalk at the base.
Harvest only one-third of the stalks at a time to prevent stressing the plant.

3. Harvesting Tips

Only harvest stalks that are 12-18 inches long.
Discard the leaves, as they are toxic due to high oxalic acid content.

Common Problems and Solutions

1. Poor Germination

Cause: Seeds not soaked or planted in unfavorable conditions.
Solution: Soak seeds before planting and ensure consistent warmth and moisture.

2. Weak Seedlings

Cause: Insufficient light or overcrowding.
Solution: Provide plenty of light and thin out weaker seedlings.

3. Crown Rot

Cause: Overwatering or poor drainage.
Solution: Plant in well-draining soil and avoid waterlogged conditions.

4. Pest Damage

Cause: Slugs and snails feeding on young seedlings.
Solution: Use organic slug deterrents or traps to protect seedlings.

FAQs About Rhubarb Seeds

1. How long does it take to grow rhubarb from seeds?
Rhubarb grown from seeds takes 1-2 years to establish before producing a significant harvest.

2. Do rhubarb seeds need to be soaked before planting?
Yes, soaking seeds improves germination rates by softening the seed coat.

3. Can I sow rhubarb seeds directly outdoors?
Yes, you can sow seeds directly outdoors after the last frost in late spring.

4. How do I care for rhubarb seedlings?
Keep the soil moist, provide sufficient light, and thin out weaker plants as needed.

5. When should I transplant rhubarb seedlings?
Transplant seedlings when they are 10-15cm tall and after the last frost.

6. How do I fertilize rhubarb grown from seeds?
Use a balanced fertilizer in early spring and add mulch to enrich the soil.

7. How often should I water rhubarb seedlings?
Water regularly, keeping the soil consistently moist but not soggy.

8. How do I protect rhubarb from frost?
Apply a thick layer of mulch over the crown in late autumn or use fleece for protection.

9. Can rhubarb be grown in containers from seed?
Yes, rhubarb grows well in large containers with nutrient-rich, well-draining soil.

10. How long do rhubarb plants last?
Rhubarb plants can produce for 10-20 years with proper care.

Conclusion

Growing rhubarb from seeds is a cost-effective and rewarding way to enjoy this versatile plant. Although it takes a little longer to establish compared to crowns or potted plants, rhubarb grown from seeds can thrive with proper care and patience. Follow this guide to successfully grow rhubarb from seeds and enjoy bountiful harvests for years to come.

Start your rhubarb-growing journey today and reap the rewards of homegrown goodness!