Can You Plant Rhubarb And Asparagus Together? A Comprehensive Guide
The answer is a nuanced one: While technically possible, planting rhubarb and asparagus together is generally not recommended for optimal growth and yield of both plants. This is due to differing nutrient requirements, potential competition for space, and the fact that asparagus is a perennial while rhubarb is a short-lived perennial.
Understanding the Rhubarb and Asparagus Debate
Rhubarb and asparagus are both perennial vegetables often grown in home gardens. They offer early-season harvests and are relatively easy to cultivate. However, their specific needs and growth habits make co-planting a potential challenge. To determine whether they can be planted together in your garden, you’ll need to consider several factors.
Asparagus: The Long-Lived Perennial
Asparagus is a long-lived perennial, meaning it can thrive for 15-20 years or more with proper care. Its delicate spears emerge in the spring, requiring consistent watering and fertilization during the growing season.
- Nutrient Needs: Asparagus needs well-drained soil rich in organic matter and benefits from regular fertilization with a balanced fertilizer.
- Space Requirements: Asparagus crowns require ample space to expand, both above and below ground. They develop an extensive root system.
- Harvesting: Asparagus is typically harvested for 6-8 weeks in the spring.
Rhubarb: The Tangy Treat
Rhubarb is a shorter-lived perennial, typically lasting 5-10 years. Its large, striking leaves and tart stalks are prized for pies, jams, and other culinary uses.
- Nutrient Needs: Rhubarb thrives in fertile soil with good drainage and benefits from regular applications of compost or well-rotted manure.
- Space Requirements: Rhubarb plants can become quite large, requiring significant space to spread.
- Harvesting: Rhubarb is harvested in the spring and early summer, taking care not to harvest too many stalks from young plants.
Competition for Resources
The main concern with planting rhubarb and asparagus together is competition for resources:
- Sunlight: Both plants require at least 6 hours of sunlight per day. If one plant shades the other, it can negatively impact growth.
- Water: While both plants require consistent moisture, overwatering can lead to root rot, particularly in asparagus.
- Nutrients: As mentioned above, their nutrient needs, while both needing plenty, may not be completely aligned, leading to one plant outcompeting the other.
- Space: As both plants mature they can become rather large. Space for their root systems and proper air flow can be problematic.
Alternative Planting Strategies
If you have limited garden space, consider these strategies:
- Separate Beds: Plant rhubarb and asparagus in separate beds to provide optimal conditions for each. This is the ideal situation.
- Strategic Placement: If planting in the same bed, position rhubarb plants on the north side of the asparagus row to prevent shading.
- Careful Spacing: Ensure ample spacing between plants to minimize competition for resources. At least 3-4 feet between plants is recommended.
When Co-Planting Might Work
In specific circumstances, co-planting might be feasible, such as:
- Large Gardens: Ample space allows for proper spacing and reduces competition.
- Controlled Conditions: Careful monitoring of soil conditions, watering, and fertilization.
- Starting Young: If planted very close together when young, and one plant eventually underperforms, it may be removed without impacting the other.
Factors To Consider
Before deciding whether to plant rhubarb and asparagus together, consider:
- Soil Type: Ensure the soil is well-drained and rich in organic matter.
- Climate: Both plants thrive in cool climates with cold winters.
- Garden Space: Evaluate available space and prioritize the needs of each plant.
Summary Table: Rhubarb vs. Asparagus
| Feature | Rhubarb | Asparagus |
|---|---|---|
| Lifespan | 5-10 years | 15-20+ years |
| Sunlight | 6+ hours daily | 6+ hours daily |
| Soil Drainage | Well-drained | Well-drained |
| Nutrient Needs | High, benefits from compost/manure | High, benefits from balanced fertilizer |
| Space Required | Large plant, 3-4 ft spacing | Expansive root system, 2-3 ft spacing |
Frequently Asked Questions (FAQs)
Is it true that rhubarb leaves are poisonous?
Yes, this is absolutely true. Rhubarb leaves contain high levels of oxalic acid, which can be toxic if ingested in large quantities. Only the stalks are safe to eat.
How long does it take for asparagus to produce a harvestable crop?
Asparagus plants typically take 2-3 years to mature before a full harvest can be obtained. It is crucial to let them establish strong root systems before harvesting heavily.
What is the best time of year to plant rhubarb?
The best time to plant rhubarb is in the early spring or late fall, when the plant is dormant. This allows the plant to establish roots before the growing season begins.
Can I grow rhubarb and asparagus in containers?
Yes, both rhubarb and asparagus can be grown in containers, but it requires large containers and consistent watering and fertilization. Container growing is generally more demanding than growing in the ground.
What are some common pests and diseases that affect rhubarb and asparagus?
Common pests and diseases include asparagus beetles, crown rot, and aphids. Regular monitoring and appropriate pest control measures are essential.
How often should I fertilize rhubarb and asparagus?
Fertilize rhubarb in the early spring with compost or well-rotted manure. Asparagus benefits from fertilization in the spring and after harvest with a balanced fertilizer.
How do I know when asparagus spears are ready to harvest?
Asparagus spears are ready to harvest when they are 6-8 inches tall and the tips are still tightly closed.
How do I properly harvest rhubarb?
To harvest rhubarb, gently pull the stalks from the base of the plant, twisting slightly. Never cut the stalks, as this can damage the plant.
Can I propagate rhubarb from seed?
Yes, but propagating from seed can be slow and unreliable. It is generally easier to propagate rhubarb by dividing existing crowns.
What is the best pH level for growing rhubarb and asparagus?
Both rhubarb and asparagus prefer a slightly acidic to neutral soil pH of around 6.0 to 7.0.
How can I improve drainage in my garden soil?
Improve drainage by adding organic matter such as compost or well-rotted manure. You can also create raised beds or install drainage tiles.
If I plant rhubarb and asparagus close together and one doesn’t thrive, will the other plant be okay?
Potentially. If you notice one plant struggling, especially due to over-shading, immediately relocating or even removing the weaker plant will help the remaining one to thrive. Close monitoring is key to ensure that neither plant adversely impacts the other.