Minnesota rhubarb transplants thrive when planted in early spring, giving roots time to settle before the growing season peaks. The best time to transplant rhubarb in minnesota is typically between late March and mid-April, as soon as the soil is workable and the frost has left the ground. This timing ensures your rhubarb crowns establish strong roots before the heat of summer arrives.
Rhubarb is a hardy perennial that loves Minnesota’s cold winters, but it needs the right start. Transplanting too late can stress the plant, while moving it too early risks frost damage to new growth. Let’s break down exactly when and how to do it.
Best Time To Transplant Rhubarb In Minnesota
The window for transplanting rhubarb in Minnesota is narrow but forgiving. Aim for early spring, when the soil temperature reaches about 40°F to 50°F. This usually happens in late March in southern Minnesota and mid-April in northern regions.
Here’s why this timing works so well:
- Cool soil encourages root growth before leaves emerge
- Plants have weeks to settle before summer heat
- Less transplant shock compared to fall moves
- You can see where old plants were before new growth hides them
Fall transplanting is possible but riskier. If you must move rhubarb in autumn, do it by mid-September so roots establish before the ground freezes. Spring remains the superior choice for most Minnesota gardeners.
Signs Your Rhubarb Is Ready To Move
Look for these cues before digging up your rhubarb:
- Soil is dry enough to crumble, not muddy
- No standing water or frozen ground
- Small red buds are just starting to swell
- Daytime temps stay above 40°F consistently
If you see green shoots already unfurling, you can still transplant but do it quickly. The sooner you move it, the better the roots will adapt.
Preparing The New Site
Rhubarb needs room to spread. Choose a spot with full sun and well-draining soil. Minnesota clay soils benefit from adding compost or aged manure before planting.
Steps to prepare the bed:
- Dig a hole 12 inches deep and 18 inches wide
- Mix in 2-3 inches of organic matter
- Space plants 3-4 feet apart
- Test soil pH – rhubarb prefers 6.0 to 6.8
Add a handful of balanced fertilizer like 10-10-10 into the bottom of the hole. This gives the roots a nutrient boost right away.
Step-By-Step Transplanting Process
Follow these steps for a smooth move:
- Water the rhubarb deeply the day before transplanting
- Dig around the plant, 6-8 inches from the crown
- Lift the clump gently with a shovel or garden fork
- Divide large crowns into sections with at least one bud each
- Trim any damaged or mushy roots
- Place the crown in the new hole so buds sit 1-2 inches below soil surface
- Backfill with soil, firming gently around roots
- Water thoroughly to settle the soil
Dont bury the crown too deep. If buds are more than 3 inches under, the plant may rot. Shallow planting is safer than deep planting.
Aftercare For Transplants
New transplants need consistent moisture for the first few weeks. Water once a week if rain is scarce. Mulch with straw or wood chips to keep soil cool and suppress weeds.
Avoid harvesting any stalks in the first year after transplanting. Let the plant focus on root development. You can take a few stalks in the second year, and full harvests begin in year three.
Fertilize lightly in early summer with a balanced fertilizer. Too much nitrogen leads to thin, weak stalks. A side dressing of compost in fall is plenty.
Common Mistakes To Avoid
Even experienced gardeners make errors with rhubarb transplants. Here are the biggest ones:
- Transplanting in hot weather – roots dry out fast
- Planting too deep – causes crown rot
- Moving plants that are too old – 10+ year old crowns struggle
- Not dividing large clumps – leads to overcrowding
- Skipping soil prep – poor drainage kills roots
Another common issue is transplanting during a dry spell. If you can’t water regularly, wait for a rainy week. Rhubarb is tough, but it needs help getting started.
When To Transplant In Northern Minnesota
Northern Minnesota gardeners face a shorter growing season. The best time to transplant rhubarb in minnesota’s northern counties is mid-to-late April, when snow has melted and soil is workable.
In zones 3a and 3b, wait until the ground thaws completely. Check soil temperature with a thermometer – 40°F at 4 inches deep is your green light. If you plant too early, frozen ground can heave the roots out.
Consider using row covers or cold frames if a late frost threatens. Rhubarb can handle light frost, but new transplants are more vulnerable.
Transplanting Rhubarb In Containers
If you lack garden space, rhubarb grows well in large containers. Use a pot at least 18 inches wide and deep. Fill with rich potting soil mixed with compost.
Container rhubarb needs more frequent watering and winter protection. Move pots to a sheltered spot or wrap them in burlap before hard freezes. The roots can survive if the container doesn’t freeze solid.
Transplant container rhubarb in early spring, just like garden plants. The same timing rules apply.
Frequently Asked Questions
Can I transplant rhubarb in summer?
Summer transplanting is risky in Minnesota. Heat stress can kill the plant. If you must move it in summer, wait for a cool, cloudy day and water daily for two weeks.
How long does rhubarb take to establish after transplanting?
Rhubarb needs about one full growing season to establish roots. You’ll see new leaves within weeks, but dont harvest until the second year.
Should I divide rhubarb before transplanting?
Yes, dividing is recommended every 5-7 years. Each division should have at least one healthy bud and a chunk of root. Discard woody or rotten sections.
What is the best soil for rhubarb in Minnesota?
Loamy soil with good drainage is ideal. Add compost to clay soils and sand to heavy soils. Rhubarb hates wet feet.
Can I transplant rhubarb in fall?
Fall transplanting is possible but less ideal. Do it by mid-September in Minnesota so roots establish before frost. Mulch heavily after planting.
Tools You’ll Need
Gather these items before starting:
- Sharp shovel or spade
- Garden fork for dividing
- Pruning shears for trimming roots
- Measuring tape for spacing
- Bucket of water for soaking roots
- Compost or aged manure
- Mulch material
Having everything ready makes the job faster. Rhubarb roots dry out quickly, so work efficiently.
How To Choose Healthy Rhubarb Crowns
If you’re buying crowns instead of moving existing plants, look for these qualities:
- Firm, plump buds with no mold
- Moist but not slimy roots
- No signs of rot or insect damage
- At least one large bud per crown
Store crowns in a cool, damp place if you can’t plant right away. Wrap them in damp newspaper and keep in the refrigerator for up to a week.
Long-Term Care For Transplanted Rhubarb
After the first year, rhubarb is low-maintenance. Here’s what to do each season:
- Spring: Remove dead leaves, apply compost
- Summer: Water during dry spells, remove flower stalks
- Fall: Cut back foliage after frost, mulch heavily
- Winter: No care needed – rhubarb goes dormant
Flower stalks should be removed as soon as they appear. They drain energy from the roots and reduce stalk production. Just snap them off at the base.
Every 5-7 years, divide and transplant your rhubarb to keep it productive. Old plants become woody and produce fewer stalks. Rejuvenate them by moving to fresh soil.
Pest And Disease Prevention
Rhubarb is generally pest-free in Minnesota, but watch for these issues:
- Crown rot: Caused by poor drainage – fix soil before planting
- Leaf spot: Remove infected leaves, improve air circulation
- Slugs: Use diatomaceous earth around plants
- Rhubarb curculio: Handpick beetles in early summer
Healthy plants resist most problems. Keep your rhubarb well-fed and properly spaced to avoid disease.
Harvesting After Transplanting
Patience pays off with rhubarb. Here’s a harvest timeline:
- Year 1: No harvest – let the plant establish
- Year 2: Take 2-3 stalks per plant
- Year 3+: Full harvest – up to 1/3 of stalks at a time
Harvest by pulling stalks gently sideways and twisting. Dont cut them – pulling encourages new growth. Stop harvesting by mid-July to let the plant store energy for next year.
Rhubarb leaves are toxic due to oxalic acid, so compost them separately. Only the stalks are edible.
Best Rhubarb Varieties For Minnesota
Choose cold-hardy varieties for best results:
- Canada Red – sweet, red stalks, very hardy
- Valentine – early producer, disease resistant
- Victoria – classic green stalks, reliable
- Riverside Giant – large stalks, good for northern zones
These varieties thrive in Minnesota’s climate and produce well for decades with proper care.
Final Tips For Success
Transplanting rhubarb in Minnesota is straightforward when you follow the calendar. Stick to early spring, prepare the soil well, and give plants time to settle. Your rhubarb will reward you with years of harvests.
One last tip: mark your transplant date on a calendar. If you move rhubarb in late March, note when to start watering and when to expect first harvests. A little planning goes a long way.
Rhubarb is one of the easiest perennials to grow in Minnesota. With the right timing, you’ll have plenty for pies, sauces, and freezing. Enjoy the process and the results.