Early Kohlrabi Growing Tips: Ever dreamt of harvesting crisp, sweet kohlrabi weeks before your neighbors? I know I have! There’s something incredibly satisfying about enjoying the fruits (or rather, vegetables!) of your labor ahead of the curve. This guide is your secret weapon to achieving just that – a bountiful kohlrabi harvest, earlier than you ever thought possible.
Kohlrabi, often called the “German turnip,” has a fascinating history, dating back to the Roman Empire. While not as widely known as its cousins like cabbage and broccoli, kohlrabi has been a staple in European gardens for centuries. Its unique flavor and versatility in the kitchen make it a rewarding addition to any home garden.
But let’s face it, gardening can be tricky! We all want to maximize our yields and extend our growing seasons. That’s where these early kohlrabi growing tips come in. By implementing a few simple DIY tricks and hacks, you can overcome common challenges like late frosts and short growing seasons. Imagine the delicious kohlrabi salads, stir-fries, and roasted dishes you can create with your early harvest! This article will provide you with the knowledge and confidence to successfully cultivate kohlrabi and enjoy its unique flavor sooner than you thought possible. So, let’s get started and unlock the secrets to an early and abundant kohlrabi harvest!
Early Kohlrabi Growing: A DIY Cold Frame Hack
Hey there, fellow gardeners! I’m so excited to share my favorite trick for getting a head start on kohlrabi season. Kohlrabi is such a delicious and versatile vegetable, and nothing beats harvesting it early in the spring. The secret? A DIY cold frame! It’s easier than you think, and it’ll give your kohlrabi seedlings the protection they need to thrive even when the weather is still a bit chilly.
Why a Cold Frame for Kohlrabi?
Kohlrabi is a cool-season crop, which means it prefers cooler temperatures and can tolerate light frosts. However, young seedlings are still vulnerable to harsh weather. A cold frame acts like a mini-greenhouse, trapping solar heat and protecting your plants from wind, rain, and those late-season frosts that can really set them back. By using a cold frame, you can start your kohlrabi seeds indoors or directly in the frame weeks before you could normally plant them outside. This translates to an earlier harvest and a longer growing season!
Materials You’ll Need
Before we dive into the construction, let’s gather our supplies. I’ve tried a few different methods over the years, and this one is my favorite for its simplicity and cost-effectiveness.
* **Clear Plastic Sheeting (Heavy-Duty):** This will be the “glass” of your cold frame. Look for a thick, UV-resistant plastic sheeting to ensure it lasts. I usually get a 6 mil thickness.
* **Wooden Boards (Reclaimed or New):** You’ll need enough boards to create a rectangular frame. The dimensions will depend on how many kohlrabi plants you want to protect. I typically use 2×6 lumber, but you can adjust based on your preference.
* **Hinges (2-3):** These will attach the lid to the frame, allowing you to open and close the cold frame for ventilation.
* **Screws or Nails:** For assembling the wooden frame and attaching the hinges.
* **Measuring Tape:** Essential for accurate cuts.
* **Saw:** To cut the wooden boards to size.
* **Drill (Optional):** Makes screwing the boards together easier.
* **Staple Gun (Optional):** To secure the plastic sheeting to the frame.
* **Gloves:** To protect your hands.
* **Safety Glasses:** Always a good idea when working with tools!
* **Soil Thermometer:** To monitor the soil temperature inside the cold frame.
* **Bricks or Rocks (Optional):** To weigh down the lid in windy conditions.
Building Your DIY Cold Frame: Step-by-Step
Okay, let’s get building! This is where the fun begins. Don’t worry if you’re not a master carpenter; this project is very forgiving.
1. Planning and Measuring
* **Decide on the Size:** Think about how many kohlrabi plants you want to grow and how much space they’ll need. A good starting point is a frame that’s about 4 feet long, 2 feet wide, and 1 foot tall. This size is manageable and provides enough room for a decent number of plants.
* **Cut the Boards:** Using your measuring tape and saw, cut the wooden boards to the appropriate lengths. You’ll need two boards for the length, two for the width, and potentially some shorter pieces for internal supports if you’re building a larger frame.
* Important Tip: I like to make the back board slightly taller than the front board. This creates a slight slope to the lid, which helps with water runoff and allows more sunlight to enter.
2. Assembling the Frame
* **Join the Boards:** Using screws or nails, assemble the wooden boards to create a rectangular frame. Make sure the corners are square and the frame is sturdy.
* **Add Supports (Optional):** If you’re building a larger frame, consider adding internal supports to prevent the sides from bowing outwards. You can simply cut some shorter pieces of wood and attach them to the inside of the frame.
* Pro Tip: Pre-drilling holes before screwing the boards together will prevent the wood from splitting.
3. Attaching the Plastic Sheeting
* **Cut the Plastic:** Cut the plastic sheeting to a size that’s slightly larger than the top of the frame. This will give you some extra material to work with.
* **Secure the Plastic:** Using a staple gun (or tacks if you don’t have a staple gun), attach the plastic sheeting to the top of the frame. Start by stapling one edge, then gently pull the plastic taut and staple the opposite edge. Repeat this process for the remaining sides, making sure the plastic is smooth and wrinkle-free.
* Alternative Method: If you don’t have a staple gun, you can use small nails or tacks to secure the plastic. Just be careful not to tear the plastic.
* Reinforce the Edges: To prevent the plastic from tearing, you can reinforce the edges with duct tape or by folding the plastic over before stapling.
4. Installing the Hinges
* **Position the Hinges:** Decide where you want to place the hinges. I usually put them along the back edge of the frame, spaced evenly apart.
* **Attach the Hinges:** Using screws, attach the hinges to the frame and the plastic-covered lid. Make sure the hinges are securely fastened.
* Test the Lid: Open and close the lid to make sure it moves smoothly. Adjust the hinges if necessary.
5. Preparing the Planting Area
* **Choose a Location:** Select a sunny spot in your garden that’s sheltered from strong winds.
* **Prepare the Soil:** Dig out the soil inside the cold frame to a depth of about 6-8 inches. Amend the soil with compost or other organic matter to improve drainage and fertility.
* Level the Soil:** Rake the soil to create a smooth, level surface.
Planting Your Kohlrabi in the Cold Frame
Now for the exciting part – planting your kohlrabi! You have two options here: starting seeds directly in the cold frame or transplanting seedlings that you’ve started indoors.
Option 1: Direct Sowing
* **Sow the Seeds:** Sow the kohlrabi seeds directly into the prepared soil, following the instructions on the seed packet.
* **Water Gently:** Water the seeds gently to moisten the soil.
* **Monitor Soil Temperature:** Use your soil thermometer to monitor the soil temperature inside the cold frame. Kohlrabi seeds germinate best when the soil temperature is between 60-70°F (15-21°C).
* Ventilate as Needed:** On sunny days, open the lid of the cold frame to prevent the soil from overheating.
Option 2: Transplanting Seedlings
* **Harden Off Seedlings:** If you’ve started your kohlrabi seedlings indoors, you’ll need to harden them off before transplanting them into the cold frame. This means gradually exposing them to outdoor conditions over a period of about a week.
* **Transplant Seedlings:** Once the seedlings are hardened off, carefully transplant them into the prepared soil in the cold frame. Space them according to the instructions on the seed packet.
* **Water Thoroughly:** Water the seedlings thoroughly after transplanting.
Maintaining Your Kohlrabi Cold Frame
Once your kohlrabi is planted, it’s important to provide proper care to ensure a successful harvest.
* **Watering:** Water regularly, especially during dry periods. Kohlrabi needs consistent moisture to thrive.
* **Ventilation:** On sunny days, open the lid of the cold frame to prevent overheating. Close the lid at night to protect the plants from frost.
* **Weeding:** Keep the cold frame free of weeds, which can compete with your kohlrabi for nutrients and water.
* **Fertilizing:** Fertilize your kohlrabi plants every few weeks with a balanced fertilizer.
* Pest Control:** Keep an eye out for pests, such as aphids and cabbage worms. If you spot any pests, take action to control them. I prefer using organic pest control methods whenever possible.
* Monitoring Temperature: Continue to monitor the soil temperature inside the cold frame and adjust ventilation as needed.
Harvesting Your Kohlrabi
Kohlrabi is typically ready to harvest about 50-60 days after planting. The bulbs should be about 2-3 inches in diameter. To harvest, simply pull the entire plant out of the ground.
Enjoy Your Early Harvest!
And that’s it! With a little bit of effort, you can build your own DIY cold frame and enjoy an early harvest of delicious kohlrabi. Happy gardening!
Conclusion
So, there you have it! Mastering these early kohlrabi growing tips is the key to unlocking a harvest of crisp, sweet bulbs weeks ahead of schedule. We’ve covered everything from seed starting indoors to hardening off seedlings and providing essential protection against those unpredictable early-season frosts. By implementing these strategies, you’re not just growing kohlrabi; you’re cultivating a resilient and productive garden that defies the limitations of the calendar.
Why is this DIY approach a must-try? Because it puts you in control. You’re no longer reliant on the whims of the weather or the availability of kohlrabi at the grocery store. You’re empowered to enjoy the unique flavor and nutritional benefits of this versatile vegetable whenever you desire. Imagine adding freshly harvested kohlrabi to your salads, stir-fries, or even enjoying it raw as a crunchy snack – all thanks to your own green thumb and a little bit of planning.
But the journey doesn’t end here! Feel free to experiment with different kohlrabi varieties. ‘Early White Vienna’ is a classic choice for early harvests, but don’t be afraid to try ‘Purple Vienna’ for a splash of color or ‘Superschmelz’ for impressively large bulbs. Consider companion planting your kohlrabi with herbs like dill or chamomile to deter pests and attract beneficial insects. You can also try succession planting, sowing seeds every few weeks, to ensure a continuous supply of kohlrabi throughout the growing season.
And remember, the key to successful early kohlrabi growing lies in consistent monitoring and adaptation. Keep an eye on the weather forecast, adjust your watering schedule as needed, and be prepared to provide extra protection if unexpected cold snaps occur. Your dedication and attention to detail will be richly rewarded with a bountiful harvest of delicious kohlrabi.
We’re confident that these early kohlrabi growing tips will transform your gardening experience. Now, it’s your turn to put them into practice! We encourage you to embark on this exciting journey and share your experiences with us. What varieties did you try? What challenges did you encounter, and how did you overcome them? Your insights and feedback will not only inspire other gardeners but also help us refine and improve these techniques for future generations. So, get your hands dirty, embrace the challenge, and let’s grow some amazing kohlrabi together! Share your photos and stories on our social media pages using #EarlyKohlrabi or leave a comment below. We can’t wait to see your kohlrabi success stories!
Frequently Asked Questions (FAQ)
Q: When is the best time to start kohlrabi seeds indoors for an early harvest?
A: Ideally, you should start your kohlrabi seeds indoors about 4-6 weeks before the last expected frost in your area. This timing allows the seedlings to develop a strong root system before being transplanted outdoors. Check your local frost dates to determine the appropriate starting time. For example, if your last frost date is typically around May 15th, you should aim to start your seeds indoors in mid-April.
Q: What type of soil is best for starting kohlrabi seeds indoors?
A: Use a high-quality seed starting mix that is lightweight, well-draining, and sterile. Avoid using garden soil, as it can be too heavy and may contain pathogens that can harm young seedlings. A good seed starting mix will provide the necessary nutrients and support for healthy germination and early growth.
Q: How often should I water kohlrabi seedlings indoors?
A: Keep the seed starting mix consistently moist but not waterlogged. Water when the top inch of soil feels dry to the touch. Use a gentle watering can or spray bottle to avoid disturbing the delicate seedlings. Overwatering can lead to damping-off, a fungal disease that can kill young plants.
Q: What kind of lighting do kohlrabi seedlings need indoors?
A: Kohlrabi seedlings require bright light to grow strong and healthy. If you don’t have a sunny windowsill that receives at least 6 hours of direct sunlight per day, you’ll need to supplement with artificial lighting. Fluorescent grow lights or LED grow lights are excellent options. Position the lights a few inches above the seedlings and adjust the height as they grow.
Q: How do I harden off kohlrabi seedlings before transplanting them outdoors?
A: Hardening off is a crucial step in preparing your seedlings for the transition to the outdoor environment. About a week before transplanting, gradually expose the seedlings to outdoor conditions. Start by placing them in a sheltered location for a few hours each day, gradually increasing the amount of time they spend outdoors. Protect them from direct sunlight, strong winds, and extreme temperatures.
Q: When is the best time to transplant kohlrabi seedlings outdoors?
A: Transplant your kohlrabi seedlings outdoors after the danger of frost has passed and the soil has warmed up to at least 50°F (10°C). Choose a cloudy day or transplant in the late afternoon to minimize stress on the plants.
Q: What type of soil is best for growing kohlrabi outdoors?
A: Kohlrabi prefers well-drained, fertile soil that is rich in organic matter. Amend your garden soil with compost or well-rotted manure before planting to improve its structure and nutrient content. The ideal soil pH for kohlrabi is between 6.0 and 7.5.
Q: How much space should I give kohlrabi plants?
A: Space kohlrabi plants about 6-8 inches apart in rows that are 12-18 inches apart. This spacing allows for adequate air circulation and prevents overcrowding, which can lead to disease problems.
Q: How often should I water kohlrabi plants outdoors?
A: Keep the soil consistently moist, especially during dry periods. Water deeply and regularly, aiming for about 1 inch of water per week. Mulching around the plants can help retain moisture and suppress weeds.
Q: What are some common pests and diseases that affect kohlrabi?
A: Common pests of kohlrabi include cabbage worms, aphids, and flea beetles. Diseases that can affect kohlrabi include clubroot and black rot. Monitor your plants regularly for signs of pests or diseases and take appropriate action if necessary. Organic pest control methods, such as using insecticidal soap or neem oil, can be effective.
Q: How do I protect kohlrabi plants from frost?
A: If a late frost is predicted, protect your kohlrabi plants with row covers, blankets, or cloches. These covers will trap heat and prevent frost damage. Remove the covers during the day to allow for air circulation and prevent overheating.
Q: When is kohlrabi ready to harvest?
A: Kohlrabi is typically ready to harvest when the bulbs are about 2-3 inches in diameter. The exact timing will depend on the variety and growing conditions. Harvest kohlrabi before the bulbs become too large, as they can become tough and woody.
Q: How do I harvest kohlrabi?
A: To harvest kohlrabi, simply cut the bulb from the stem just above the soil line. You can also harvest the leaves, which are edible and can be used in salads or stir-fries.
Q: Can I grow kohlrabi in containers?
A: Yes, kohlrabi can be successfully grown in containers. Choose a container that is at least 12 inches in diameter and 12 inches deep. Use a high-quality potting mix and provide adequate drainage. Water and fertilize regularly.
Q: What are some good companion plants for kohlrabi?
A: Good companion plants for kohlrabi include dill, chamomile, onions, garlic, and rosemary. These plants can help deter pests and attract beneficial insects. Avoid planting kohlrabi near tomatoes, strawberries, or beans, as they can compete for nutrients or attract pests.
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