Maryland’s coastal regions allow for slightly earlier planting than its western mountainous areas. Knowing the best time to plant rhubarb in maryland is key to a strong harvest. This guide covers everything you need for success.
Rhubarb is a perennial vegetable that thrives in cooler weather. It needs a winter chill to produce well. Maryland’s varied climate means timing matters.
You want to plant when the soil is workable but still cool. This gives roots time to establish before summer heat. Let’s break down the specifics for your area.
Best Time To Plant Rhubarb In Maryland
The ideal window is early spring, as soon as the ground thaws. For most of Maryland, this means March to early April. Soil temperature should be around 40-50°F.
Planting too late risks poor root growth. The plant may struggle through hot summers. Aim for a time when frost is still possible but not severe.
Here is a simple breakdown by region:
- Eastern Shore and Southern Maryland: Plant from mid-March to early April. Warmer coastal air allows earlier starts.
- Central Maryland (including Baltimore and DC suburbs): Plant from late March to mid-April. Soil warms slower here.
- Western Maryland (mountains and higher elevations): Plant from early to late April. Frost can linger into May.
Check your local frost dates. A good rule is to plant 2-4 weeks before the last expected frost. This gives rhubarb a head start.
Fall Planting Considerations
Fall planting is possible but riskier in Maryland. You can plant rhubarb in September or October. The plant needs 6-8 weeks before the ground freezes.
Fall-planted rhubarb may not establish well. Cold snaps can damage young roots. Spring planting is far more reliable for beginners.
If you try fall planting, mulch heavily after the ground freezes. This protects roots from heaving. Only do this if you have mild winters.
Understanding Maryland’s Climate Zones
Maryland spans USDA hardiness zones 5b to 8a. This affects planting times. Zone 5b (western mountains) is colder than zone 8a (coastal areas).
Rhubarb needs a dormancy period with temperatures below 40°F. Maryland’s winters provide this well. But warmer zones may have shorter chill periods.
Here is how zones affect timing:
- Zone 5b-6a (Western MD): Plant in late April. Soil warms slowly. Expect harvests in late spring.
- Zone 6b-7a (Central MD): Plant in early to mid-April. Good balance of cold and warmth.
- Zone 7b-8a (Coastal MD): Plant in mid-March. Warmer winters mean earlier starts.
Your specific microclimate matters. A sheltered garden in the city may warm faster. A windy hillside will stay cooler. Observe your own yard.
Soil Temperature And Preparation
Rhubarb prefers well-drained soil rich in organic matter. Test your soil pH; aim for 6.0-6.8. Add compost or aged manure before planting.
Soil temperature is critical. Use a soil thermometer. Wait until the soil reaches at least 40°F at a 4-inch depth. Colder soil slows root growth.
Here are steps to prepare your bed:
- Choose a sunny spot with good drainage. Rhubarb needs 6-8 hours of sun daily.
- Remove weeds and rocks. Dig the soil to 12-15 inches deep.
- Mix in 2-4 inches of compost or well-rotted manure.
- Add a balanced fertilizer like 10-10-10 if needed.
- Rake the bed smooth and water it well.
Good preparation prevents problems later. Rhubarb can live for 10-15 years. Invest time now for long-term rewards.
Choosing The Right Rhubarb Varieties For Maryland
Not all rhubarb varieties perform equally in Maryland. Some handle humidity better. Others are more cold-tolerant.
Here are top choices for Maryland gardens:
- Victoria: A classic variety. It is reliable and produces thick stalks. Good for most of Maryland.
- Canada Red: Known for sweet, red stalks. It tolerates heat better than some. Ideal for central and coastal areas.
- Valentine: Early maturing with bright red color. Works well in cooler mountain regions.
- Riverside Giant: Produces large, green stalks. It is very cold-hardy. Best for western Maryland.
Choose disease-resistant varieties. Rhubarb can suffer from fungal issues in humid summers. Look for varieties labeled as resistant.
Where To Buy Rhubarb Crowns
You can buy rhubarb crowns from local nurseries or online. Local nurseries often stock varieties suited to your area. Ask for advice on timing.
Online retailers ship crowns in early spring. Order early to avoid sellouts. Check that the seller ships to Maryland.
Inspect crowns before planting. They should be firm with visible buds. Avoid soft or moldy crowns. Healthy crowns ensure strong growth.
Step-By-Step Planting Guide
Planting rhubarb correctly sets you up for success. Follow these steps for the best results.
- Dig holes 2-3 feet apart. Rhubarb spreads wide. Space rows 3-4 feet apart.
- Make holes deep enough to cover the crown with 1-2 inches of soil. The buds should be just below the surface.
- Place the crown in the hole with buds facing up. Spread roots outward.
- Backfill with soil and firm gently. Water thoroughly to settle the soil.
- Add a 2-inch layer of mulch around the plant. Use straw, wood chips, or shredded leaves.
Water regularly after planting. Keep soil moist but not waterlogged. Rhubarb needs about 1 inch of water per week.
Do not harvest in the first year. Let the plant establish its root system. You can take a few stalks in the second year. Full harvests start in year three.
Mulching And Weed Control
Mulch helps retain moisture and suppress weeds. It also moderates soil temperature. Apply mulch after planting and again in fall.
Use organic mulch like straw or shredded bark. Avoid fresh manure; it can burn roots. Replenish mulch as it decomposes.
Weeds compete with rhubarb for nutrients. Hand-pull weeds regularly. Avoid deep cultivation that might damage shallow roots.
Caring For Rhubarb Throughout The Season
Rhubarb needs consistent care for best production. Water deeply during dry spells. Fertilize lightly in early spring.
Remove flower stalks as soon as they appear. Flowering diverts energy from stalk growth. Cut them at the base.
In late fall, cut back dead leaves. Apply a layer of compost or aged manure. This feeds the plant for next year.
Fertilizing Rhubarb
Rhubarb is a heavy feeder. Apply a balanced fertilizer in early spring. Use 10-10-10 at a rate of 1/2 cup per plant.
Side-dress with compost in midsummer. This provides slow-release nutrients. Avoid high-nitrogen fertilizers; they promote leaf growth over stalks.
Test your soil every 2-3 years. Adjust fertilizer based on results. Over-fertilizing can lead to weak stalks.
Common Problems And Solutions
Rhubarb is generally low-maintenance. But issues can arise. Here are common problems and fixes.
- Crown rot: Caused by poor drainage. Improve soil drainage or plant in raised beds.
- Leaf spots: Fungal disease from humidity. Remove affected leaves. Improve air circulation.
- Slugs and snails: They eat young leaves. Use diatomaceous earth or beer traps.
- Bolting: Early flowering due to stress. Remove flower stalks promptly. Water consistently.
Most problems are preventable with good care. Healthy plants resist pests and diseases better. Monitor your plants weekly.
When To Harvest Rhubarb
Harvest stalks when they are 12-18 inches long. Pull them gently from the base. Do not cut; pulling encourages new growth.
Harvest only 1/3 of the stalks at a time. Leave at least 2/3 to keep the plant healthy. Stop harvesting by late June or early July.
Never eat rhubarb leaves; they are toxic. The stalks are safe and delicious. Store harvested stalks in the refrigerator for up to a week.
Extending The Growing Season
You can extend rhubarb’s growing season in Maryland. Use row covers or cold frames in early spring. This protects plants from late frosts.
In fall, mulch heavily to delay ground freezing. This allows a few extra weeks of growth. But don’t force the plant too late.
Rhubarb needs a dormant period. Forcing it to grow year-round weakens the plant. Let it rest in winter.
Forcing Rhubarb For Earlier Harvest
Forcing rhubarb produces tender, pink stalks weeks earlier. Cover crowns with a forcing pot or bucket in late winter. Exclude light completely.
Check after 4-6 weeks. Harvest stalks when they are 12-18 inches tall. Forced rhubarb is milder and sweeter.
Only force established plants (3+ years old). Do not force the same plant two years in a row. It needs recovery time.
Frequently Asked Questions
1. Can I plant rhubarb in Maryland in summer?
No, summer planting is not recommended. Heat stresses young plants. Stick to early spring or fall.
2. What is the latest I can plant rhubarb in Maryland?
For spring, plant by mid-April in most areas. For fall, plant by early October. Later than that risks poor establishment.
3. How deep should I plant rhubarb crowns?
Cover the crown with 1-2 inches of soil. Buds should be just below the surface. Planting too deep can cause rot.
4. Does rhubarb grow well in containers in Maryland?
Yes, but use large containers (at least 18 inches deep and wide). Ensure good drainage. Container plants need more frequent watering.
5. How long does rhubarb take to mature in Maryland?
From planting, expect a small harvest in year two. Full production starts in year three. Patience is key.
Final Tips For Success
Planting rhubarb at the right time is crucial. Maryland’s diverse climate requires attention to your specific zone. Start with healthy crowns and good soil.
Water consistently and mulch well. Remove flower stalks and weeds. Harvest responsibly to keep plants productive.
With proper care, your rhubarb will thrive for years. Enjoy fresh stalks in pies, sauces, and jams. The effort is well worth it.
Remember, the best time to plant rhubarb in maryland is early spring. Check your local frost dates and soil temperature. Happy planting!