Oregon’s rainy springs and mild summers create perfect conditions for planting rhubarb in early spring. If you’re wondering about the best time to plant rhubarb in oregon, the answer is straightforward: aim for late February through early April, as soon as the soil is workable. This timing gives your rhubarb crowns a head start before the warmer weather arrives.
Best Time To Plant Rhubarb In Oregon
Planting rhubarb at the right moment is crucial for a strong harvest. In Oregon, the window is narrow but forgiving if you pay attention to soil conditions. You want the ground to be thawed and not waterlogged, which often happens after the last hard frost.
Understanding Oregon’s Climate Zones
Oregon has diverse climates, from the wet Willamette Valley to the drier eastern regions. Your exact location affects the planting schedule. Coastal areas stay cooler longer, while inland valleys warm up faster.
- Western Oregon (Portland, Salem, Eugene): Plant from late February to mid-March
- Eastern Oregon (Bend, Pendleton): Plant from mid-March to early April
- Southern Oregon (Medford, Ashland): Plant from late February to early March
- Coastal areas (Astoria, Newport): Plant from mid-March to early April
Soil Temperature Matters
Rhubarb crowns need soil temperatures above 40°F to start growing. Use a soil thermometer to check. If the ground is still frozen or too wet, wait a week or two. Planting too early in cold mud can rot the crowns.
Oregon’s spring rains can delay planting. If your garden is soggy, consider raising beds or planting in mounds to improve drainage. Rhubarb hates wet feet.
Preparing Your Garden For Rhubarb
Before you plant, get the site ready. Rhubarb is a perennial that can produce for 10 years or more, so choose a spot wisely. Full sun is best, but partial shade works in hotter areas.
Soil Preparation Steps
- Clear the area of weeds and grass. Rhubarb does not compete well with weeds.
- Loosen the soil to a depth of 12-18 inches. Use a garden fork or tiller.
- Mix in 2-4 inches of compost or well-rotted manure. Rhubarb loves rich soil.
- Test the pH. Aim for 6.0 to 6.8. Add lime if needed to raise pH.
- Add a balanced fertilizer like 10-10-10 at planting time, following package directions.
Choosing Rhubarb Varieties For Oregon
Not all rhubarb varieties perform equally in Oregon’s climate. Some are better suited for wet springs or cooler summers. Pick a variety that matches your region.
- Victoria: Classic green-stalked variety, reliable in all Oregon zones
- Canada Red: Red stalks, sweeter flavor, good for western Oregon
- Valentine: Early producer, handles wet soil well
- Crimson Red: Deep red color, thrives in cooler coastal areas
- Riverside Giant: Large stalks, good for eastern Oregon’s drier conditions
Planting Rhubarb Crowns Step By Step
Now that the soil is ready and the timing is right, follow these steps to plant your rhubarb. You can start from crowns (dormant roots) or divisions from an existing plant. Crowns are easier for beginners.
How To Plant Rhubarb Crowns
- Dig a hole about 12 inches wide and 12 inches deep. Make it large enough for the root system.
- Place the crown in the hole with the buds facing up. The top of the crown should be 1-2 inches below the soil surface.
- Backfill with soil, firming gently around the roots. Do not pack too tightly.
- Water thoroughly after planting. This settles the soil and removes air pockets.
- Space multiple plants 3-4 feet apart. Rhubarb grows large and needs room.
- Add a 2-inch layer of mulch around the plant, but keep it away from the crown to prevent rot.
Planting Rhubarb From Seed
Growing rhubarb from seed takes longer but is cheaper. Start seeds indoors 8-10 weeks before your planting date. Transplant seedlings outdoors after the last frost. Note that seed-grown plants may not produce stalks for 2 years.
If you use seeds, plant them 1/4 inch deep in seed-starting mix. Keep the soil moist and warm. Harden off seedlings before moving them outside.
Caring For New Rhubarb Plants
After planting, your rhubarb needs consistent care to establish strong roots. Oregon’s spring rains often provide enough water, but check the soil weekly. Water deeply if the top 2 inches feel dry.
First Year Care
Do not harvest any stalks during the first growing season. Let the plant focus on root development. Remove flower stalks as soon as they appear to direct energy back to the roots.
- Water regularly during dry spells, especially in summer
- Fertilize with a balanced fertilizer in early spring and again after harvest
- Mulch with compost each fall to protect the crown from winter cold
- Remove dead leaves in late fall to prevent disease
Pest And Disease Management
Rhubarb is generally tough, but Oregon’s damp conditions can cause problems. Watch for these common issues:
- Crown rot: Caused by poor drainage. Plant in raised beds if needed.
- Leaf spot: Fungal disease from wet leaves. Water at the base, not overhead.
- Slugs and snails: Common in Oregon. Use iron phosphate bait or hand pick them.
- Rhubarb curculio: A small weevil that damages stalks. Remove affected stalks.
Harvesting Rhubarb In Oregon
You can start harvesting lightly in the second year. In the third year and beyond, harvest for 4-6 weeks during spring and early summer. Oregon’s cool springs extend the harvest season nicely.
When And How To Harvest
Harvest stalks when they are 12-18 inches long and firm. Pull them gently from the base, twisting slightly. Never cut stalks, as this can leave stubs that rot.
- Take only 1/3 to 1/2 of the stalks at a time
- Leave at least 6-8 stalks on the plant to keep it healthy
- Stop harvesting by mid-July to let the plant recover
- Remove any flower stalks immediately to prolong harvest
Storing And Using Rhubarb
Fresh rhubarb keeps in the fridge for 2-3 weeks. Wrap stalks in a damp paper towel and place in a plastic bag. You can also freeze rhubarb for later use. Chop it into pieces and freeze on a baking sheet, then transfer to a freezer bag.
Rhubarb is perfect for pies, jams, and sauces. Its tart flavor pairs well with strawberries or apples. Oregon’s rhubarb season is short, so make the most of it.
Common Mistakes When Planting Rhubarb In Oregon
Even experienced gardeners make errors. Avoid these common pitfalls to ensure a healthy rhubarb patch.
Planting Too Deep
Burying the crown too deep is a frequent mistake. The buds need to be near the soil surface to sprout properly. If you plant too deep, the crown may rot or fail to grow.
Harvesting Too Early
Resist the urge to pick stalks in the first year. The plant needs all its leaves to build energy for future harvests. Patience pays off with bigger yields later.
Ignoring Soil Drainage
Oregon’s clay soils can hold too much water. If your garden has heavy clay, amend it with compost or plant in raised beds. Poor drainage is the top cause of rhubarb failure in Oregon.
Overcrowding
Rhubarb plants spread as they mature. Give them enough space from the start. Crowded plants compete for nutrients and produce smaller stalks.
Extending The Rhubarb Season In Oregon
You can enjoy rhubarb longer by using a few simple techniques. Oregon’s mild climate allows for some creative season extension.
Forcing Rhubarb For Early Harvest
Forcing rhubarb means covering the crown in late winter to encourage early growth. Use a forcing pot or a bucket to block light. The stalks grow pale and tender, ready 3-4 weeks earlier than normal.
- Cover crowns in January or February
- Use a container that blocks all light
- Harvest stalks when they reach 12-18 inches
- Remove the cover after harvesting to let the plant recover
Succession Planting
Plant multiple varieties with different maturity dates. Early varieties like Valentine produce first, while later ones like Riverside Giant extend the harvest. This gives you fresh rhubarb from March through June.
Frequently Asked Questions
Can I plant rhubarb in the fall in Oregon?
Fall planting is possible but riskier. The best time to plant rhubarb in oregon is early spring. Fall-planted crowns may not establish well before winter frosts. If you try fall planting, do it in September and mulch heavily.
How long does rhubarb take to grow in Oregon?
From planting a crown, you can expect light harvests in the second year. Full harvests begin in the third year. Rhubarb plants can produce for 10-15 years with proper care.
Should I fertilize rhubarb in Oregon?
Yes, fertilize in early spring with a balanced fertilizer like 10-10-10. Apply again after harvest in late spring. Avoid high-nitrogen fertilizers, which promote leaf growth over stalk production.
What is the best location for rhubarb in an Oregon garden?
Choose a spot with full sun and well-drained soil. Avoid low areas where water pools. A south-facing slope is ideal for warming the soil early in spring.
Can rhubarb grow in containers in Oregon?
Yes, but use a large container at least 18 inches wide and deep. Ensure drainage holes are present. Container-grown rhubarb needs more frequent watering and fertilizing than in-ground plants.
Final Tips For Oregon Rhubarb Growers
Rhubarb is one of the easiest perennials to grow in Oregon. With the right timing and care, you will have plenty of stalks for pies and preserves. Remember that the best time to plant rhubarb in oregon is early spring, when the soil is workable but not soggy.
Keep an eye on the weather forecast. If a late frost threatens, cover new plants with row cover or old sheets. Rhubarb is cold-hardy, but tender new growth can be damaged.
Join a local gardening group or extension service for region-specific advice. Oregon State University Extension offers great resources for gardeners in every part of the state. They can help with variety selection and pest management tailored to your area.
Enjoy the process of growing your own rhubarb. It is a rewarding crop that comes back year after year with minimal effort. Share extra stalks with neighbors or use them in creative recipes. Your Oregon garden will thank you.