Kansas experiences sudden temperature swings that can damage newly planted rhubarb crowns. Finding the best time to plant rhubarb in kansas is key to a strong harvest.
Rhubarb is a hardy perennial that thrives in cooler weather. In Kansas, timing is everything because our springs can be short and our summers intense.
Plant at the wrong time, and your crowns might rot or bolt to seed. Get it right, and you will have stalks for pies and sauces for years.
Best Time To Plant Rhubarb In Kansas
The ideal window for planting rhubarb in Kansas is early spring, as soon as the soil is workable. This usually falls between mid-March and early April, depending on your specific zone.
In eastern Kansas, aim for late March. In western parts, early to mid-April is safer. The key is to plant when the ground has thawed but before the heat of late spring arrives.
Rhubarb needs a chilling period to produce well. Planting too late in spring can stress the crowns. Planting in fall is possible but riskier due to Kansas winter freezes.
Why Spring Is The Best Season
Spring planting gives rhubarb time to establish roots before summer heat. The soil is moist from snow melt and rain, which helps crowns settle in.
Kansas summers can hit 100°F. Rhubarb hates that. Spring planting lets the plant grow during cool weather, building strength for the next year.
You will not harvest much the first year. That is normal. Let the plant focus on root growth. Patience pays off with bigger harvests in year two and beyond.
Soil Temperature Matters
Rhubarb crowns need soil temperatures between 40°F and 50°F to start growing. Use a soil thermometer to check. If the soil is still frozen or too wet, wait.
In Kansas, soil warms up unevenly. Sandy soils warm faster than clay. Test your garden bed a few days before planting to be sure.
Cold, wet soil can cause crown rot. If you plant too early and a hard freeze hits, cover the crowns with mulch or straw for protection.
Kansas Climate Zones And Rhubarb
Kansas spans USDA hardiness zones 5b to 7a. This affects your planting calendar. Northern Kansas is colder, so you plant later. Southern Kansas is warmer, so you can plant a bit earlier.
- Zone 5b (northwest Kansas): Plant in early to mid-April. Soil may stay cold longer.
- Zone 6a (central Kansas): Plant in late March to early April. Good balance.
- Zone 6b (eastern Kansas): Plant in mid to late March. Warmer springs.
- Zone 7a (southeast Kansas): Plant in early to mid-March. Mildest winters.
Check your exact zone using the USDA map. Your local extension office can give more precise advice for your county.
Fall Planting Risks
Some gardeners plant rhubarb in fall, but this is not ideal in Kansas. Winter freezes can heave crowns out of the ground. Snow cover helps, but it is unreliable here.
If you try fall planting, do it in October. Mulch heavily with straw or leaves. Even then, survival rates are lower than spring planting.
Stick with spring for the best results. It gives the plant a full growing season to settle in before winter.
Preparing Your Garden Bed
Rhubarb needs well-drained soil with lots of organic matter. Kansas soil is often heavy clay or alkaline sand. Both need ammendment.
Start by choosing a spot with full sun. Rhubarb can take partial shade, but full sun gives the best growth. Avoid low areas where water pools.
- Test your soil pH. Rhubarb likes pH between 6.0 and 6.8. Kansas soil is often alkaline. Add sulfur or peat moss to lower pH if needed.
- Dig a deep bed. Rhubarb roots go deep. Loosen soil to 12-18 inches. Remove rocks and weeds.
- Mix in compost. Add 2-3 inches of well-rotted compost or aged manure. This improves drainage and fertility.
- Add fertilizer. Work in a balanced fertilizer like 10-10-10 at planting time. Follow package rates.
Do this a week before planting. Let the soil settle. Water the bed well the day before you plant.
Choosing Rhubarb Varieties For Kansas
Not all rhubarb varieties handle Kansas heat equally. Choose types bred for warmer climates or disease resistance.
- Victoria: Classic variety, reliable, good for pies. Tolerates some heat.
- Canada Red: Deep red stalks, sweeter flavor. Good for Kansas.
- Raspberry Red: Early producer, bright color. Handles humidity well.
- Valentine: Vigorous grower, disease resistant. Good choice for beginners.
Avoid varieties that need long, cold winters. They may not produce well in southern Kansas. Ask at your local nursery for regional recommendations.
How To Plant Rhubarb Crowns
Planting rhubarb is simple if you follow a few steps. Crowns are dormant roots with buds. They are available at garden centers in early spring.
- Dig holes. Make them 2-3 feet apart. Rhubarb spreads wide. Space rows 4 feet apart.
- Set the crown. Place it so the buds are 1-2 inches below the soil surface. Do not bury too deep.
- Cover with soil. Firm it gently around the crown. Do not pack tightly.
- Water thoroughly. Give each crown about 1 inch of water. Keep soil moist but not soggy.
- Mulch lightly. Add 1-2 inches of straw or wood chips. This retains moisture and suppresses weeds.
Water every few days if rain is scarce. Rhubarb needs consistent moisture during establishment. Once established, it is more drought tolerant.
Growing From Seed Vs. Crowns
Most gardeners plant crowns because they are faster. Seeds take longer and may not produce true to type. Crowns give you a one-year head start.
If you use seeds, start them indoors 8-10 weeks before last frost. Transplant after danger of frost passes. Expect to wait two years for harvest.
Crowns are worth the small extra cost. They are more reliable and easier to plant. Buy from reputable suppliers to avoid disease.
Caring For Rhubarb In Kansas
Once planted, rhubarb needs basic care. Kansas weather can be tough, but rhubarb is resilient if you help it along.
Watering
Water deeply once a week during dry spells. Rhubarb needs about 1-1.5 inches of water per week. In Kansas summers, you may need to water more.
Drip irrigation works well. It keeps leaves dry and reduces disease. Avoid overhead watering in humid weather.
Mulch helps retain moisture. Replenish mulch each spring. It also keeps soil cool in summer.
Fertilizing
Fertilize in early spring before growth starts. Use a balanced fertilizer like 10-10-10. Apply about 1/2 cup per plant, scattered around the base.
Do not over-fertilize. Too much nitrogen makes stalks thin and leafy. Organic options include compost tea or fish emulsion.
Side-dress with compost in mid-summer. This gives a slow nutrient release. Avoid fertilizing after August to let plants harden for winter.
Weeding
Keep the bed weed-free. Weeds compete for water and nutrients. Mulch helps, but hand-pull weeds that get through.
Be careful not to disturb rhubarb roots. They are shallow and easily damaged. Use a hoe lightly or pull by hand.
Harvesting Rhubarb In Kansas
Do not harvest the first year. Let the plant build energy. In the second year, you can take a few stalks. By the third year, you can harvest fully.
Harvest in spring and early summer. Stop when stalks get thin or leaves look tired. Kansas heat usually ends the season by July.
- Choose stalks. Pick ones that are at least 12 inches long and firm. Avoid thin or wilted stalks.
- Pull, don’t cut. Grasp the stalk near the base and pull gently. Twist slightly to detach it. Cutting leaves stubs that can rot.
- Leave leaves. Remove leaves from stalks. Leaves are toxic. Compost them or discard.
- Stop by July. Stop harvesting when stalks get small. Let the plant regrow for next year.
Never take more than half the stalks at once. The plant needs leaves to photosynthesize. Over-harvesting weakens it.
Dealing With Bolting
Bolting is when rhubarb sends up a flower stalk. This happens in heat or stress. It reduces stalk production.
If you see flower stalks, cut them off immediately. This redirects energy back to the roots. Bolting is common in Kansas summers.
To prevent bolting, keep plants well-watered and mulched. Choose bolt-resistant varieties like Canada Red.
Common Problems And Solutions
Rhubarb is generally pest-free, but Kansas conditions can cause issues. Here are a few to watch for.
Crown Rot
This happens in wet, heavy soil. Symptoms include soft, mushy crowns and yellow leaves. Prevent by planting in well-drained soil. Avoid overwatering.
If crown rot appears, dig up the plant. Cut away rotten parts. Replant in a drier spot. Sometimes you have to start over.
Leaf Spot
Fungal spots on leaves are common in humid Kansas summers. They are usually cosmetic. Remove affected leaves and improve air circulation.
Space plants properly. Avoid overhead watering. Fungicides are rarely needed.
Rhubarb Curculio
This small beetle bores into stalks. It is more common near wild plants. Hand-pick beetles if you see them. Remove nearby weeds that host them.
Damage is usually minor. Healthy plants outgrow it. No chemical control is necessary.
Winter Care For Rhubarb
Rhubarb goes dormant in winter. In Kansas, it needs protection from freeze-thaw cycles. These can heave crowns out of the ground.
After the first hard frost, cut back dead leaves. Leave a few inches of stem. This marks the spot and protects the crown.
Mulch heavily with 4-6 inches of straw, leaves, or wood chips. This insulates the soil. Remove mulch in early spring when growth starts.
In very cold parts of Kansas, add a layer of row cover or burlap. This extra protection helps in zone 5b.
Dividing And Transplanting
Rhubarb plants get crowded after 4-5 years. Dividing them keeps them productive. Do this in early spring or fall.
- Dig up the crown. Use a shovel to lift the entire root ball. Be careful not to break it.
- Divide into sections. Each section should have at least one bud and a few roots. Use a sharp knife.
- Replant immediately. Follow the same planting steps as for new crowns. Space them 3 feet apart.
- Water well. Keep the divisions moist until they establish.
Dividing rejuvenates old plants. You can share divisions with friends. It is a great way to expand your patch.
Frequently Asked Questions
Can I plant rhubarb in Kansas in the fall?
It is possible but risky. Fall planting gives less time for roots to establish before winter. Spring planting is much more reliable in Kansas.
How long does rhubarb take to grow in Kansas?
From planting a crown, you can expect a small harvest in the second year. Full production starts in year three. Plants live 10-15 years with good care.
What is the best rhubarb variety for Kansas heat?
Canada Red and Valentine are top choices. They tolerate heat better than older varieties. Ask your local nursery for regional favorites.
Do I need to cover rhubarb in Kansas winter?
Mulching is usually enough. In northern Kansas, add row cover for extra protection. Snow cover also helps insulate the crowns.
Can I grow rhubarb in containers in Kansas?
Yes, but use large containers at least 18 inches deep. Move them to a shaded spot in summer. Water more often. Container plants need winter protection too.
Final Tips For Success
Plant at the right time, and rhubarb will reward you for years. In Kansas, that means early spring when soil is workable but not wet.
Prepare the bed well. Choose a sunny spot with good drainage. Add compost and check pH. Pick a variety that handles our climate.
Be patient the first year. Do not harvest. Water and weed consistently. Mulch for winter protection.
By year three, you will have plenty of stalks for pies, sauces, and freezing. Rhubarb is a low-maintenance crop that fits well into Kansas gardens.
If you miss the spring window, you can still plant in fall with extra care. But for the best results, mark your calendar for late March or early April.
Your rhubarb patch will become a perennial source of pride. With the right timing and a little effort, you will enjoy homegrown rhubarb for many seasons to come.