Updated at: 25-04-2022 - By: Sienna Lewis

Learn how to grow kale in a greenhouse in Indiana by reading this guide. Kale thrives in colder climates, such as Indiana, where it thrives. Kale thrives in cool weather because it enhances the nutty flavor and sweetness of the leafy greens by bringing out their natural sweetness.

About Kale

There are many “cole crops” out there, such as cabbage, broccoli, brussels sprouts, etc. Kale is one of them.

In the spring, kale can be started from seed and young kale plants can be set out very early (3 to 5 weeks before the last frost). Kale, on the other hand, does best in lower autumn temperatures in many places. When the leaves of kale are older, they taste better.

How to Plant Kale in a Greenhouse in Indiana - Krostrade

Kale can be grown in the ground, on raised beds, or in containers, making it a very adaptable crop. Adding it to salads, stir fries, omelettes and casseroles is another a healthful and diverse way to get it into your diet.

When to Plant Kale

Growing kale is as simple as starting the seeds indoors or outside.

  • Direct-sow seeds outside as soon as the soil is workable in the spring for an early summer yield. Direct-sow seeds about three months before the first fall frost date for a winter or fall crop.
  • Three to five weeks before the last spring frost date, young kale plants can be planted in the garden. At night, it’s preferable to protect young plants from freezing temperatures.
  • Young kale plants can be planted six to eight weeks before the first fall frost in order to reap a harvest in the fall. Hard frosts (25 to 28 degrees F) will not harm kale, and it can even weather temperatures in the low 20s to upper teens without harm.
  • In mild winter regions like the Southwest, Pacific Northwest, and the Southeast, kale can also be grown as a winter vegetable, either under cover or outside. Throughout the winter, they’ll continue to develop and produce new crops. The cooperative extension service in your area can help you decide whether or not to plant winter veggies.

Choosing and Preparing a Planting Site

  • In full sun, kale thrives, but it can also survive in moderate shade.
  • It is recommended that the soil pH be between 6.5 and 6.8 to minimize the risk of illness, however kale will grow in more alkaline soils up to a pH of 7.5. (You may test your pH with a kit from your local cooperative extension office or garden supply store).
  • Add blood meal or nitrogen-rich compost to your soil if the results of the test indicate that it needs it. Add some compost if you didn’t test the soil.)
  • For sensitive leaves, the soil must be well-drained and rich in nutrients. You should add fertilizer to the soil while planting (about 1-1/2 cups 5-10-10 fertilizer for each 25-foot row into the top 3 to 4 inches).

The Best Time to Plant Kale in Indiana

It’s important to know when to plant your fruits and veggies so that you can receive the finest results. Keeping track of the first and final frost dates will help you choose when to grow kale. USDA plant hardiness zones 5 and 6 encompass Indiana. Kale planting season in Indiana runs from now until:

Zone 5

Early April is the best time to start kale seeds indoors and harvest by the end of June; or mid-July is a better time to start kale seeds and harvest by the end of October.

Zone 6

The best time to sow kale seedlings indoors is between mid-March and mid-June, or between early August and mid-November.

How to Plant Kale in Indiana

In Indiana, kale may be grown without difficulty. Here’s a step-by-step instruction to show you exactly what to do:

Sowing kale seeds or setting plants

Light, airy, and well-drained soil should be used to plant the seeds. Thin the seedlings as soon as they emerge (typically after two weeks) and space them at least eight inches apart.

Start by planting your plants at the same depth in your garden as they are growing in their pots. A minimum of 18 inches should separate them. Water your seeds or seedlings well once they’ve been planted.

Growing kale

Your kale plants will thrive if you water and feed them with a continuous-release plant food. An inch or an inch and a half of water a week should suffice if rain is scarce in your location.

Mulch the soil if it’s going to be hot, because kale won’t do well in such environment. Weeds can also be prevented by mulching. Make sure to re-mulch the soil after the first harsh cold. The leaves of your kale plants may continue to grow in the winter.

Harvesting kale

When the leaves of the kale are the size of your hand, it’s time to harvest it. Take only a few kale leaves at a time from the lowest section of the plant, starting with the oldest leaves. Toss out wilting and gnarled leaves.

Your kale will be more fruitful if you don’t remove the terminal bud in the top center of the plant. If the temperature drops below 20 degrees Fahrenheit, kale plants will continue to develop and the flavor will be enhanced. Using a tiny greenhouse to shield your plants from the cold can help you extend your growth season or yield.

Storing kale

Kale may be stored in the same way as other leafy greens. kale can be placed inside of a produce bag, but it should not be stuffed. place it in the refrigerator to keep. Eat it before it goes bad, which is usually around a week.

How to Grow Kale in a Hobby Greenhouse: A Step-By-Step Guide - Krostrade

Reasons Why It’s Best to Grow Kale in a Mini Greenhouse

If you’re planning to grow your kale in your backyard, don’t do it that way. It is possible to grow kale all year round in a little greenhouse because you can adjust the temperature within the greenhouse.

You can also grow kale in the greenhouse for these additional benefits:

Protect your plants from harmful pests

Insects, animals, and other vermin enjoy munching on your kale, including cabbageworms, cabbage aphids, flea beetles, mice, raccoons, and more. These pesky insects are kept at bay by enclosing them in a greenhouse. It also protects them from being infected by pathogens carried by nearby plants.

Keep them safe from unpredictable weather conditions

Your plants can be damaged by extreme heat, heavy rainfall, storms, and powerful winds. Kale and other vegetables may be grown more easily in a greenhouse in places like Indiana, where the weather might change at any moment. Having a greenhouse is a need for residents of Indiana, where temperatures can fluctuate greatly and rain and other weather conditions might arrive at any time.

Perfect for gardeners with limited space

If you don’t have enough room to produce kale, you may want to consider a little greenhouse. A 6 foot greenhouse is considered a “small” greenhouse, but smaller greenhouses are available. Patios, decks, balconies, and even tables can all benefit from the addition of a small greenhouse. Even if it’s smaller than a normal greenhouse, you’ll still reap the same benefits.

Ideal for beginners in greenhouse technology

Greenhouse novices will find little greenhouses to be the perfect learning tool. Investment in a more permanent greenhouse can be costly. Preparation and experience are key factors in the success of a small greenhouse before investing in a larger one. All of this may be accomplished at a lower cost with a small greenhouse.

Quick Guide to Growing Kale

  • Plant kale 3 to 5 weeks before the last expected frost date.. It’s possible to produce food in the ground, in raised beds, or in containers of any kind.
  • You should plant kale in a place that receives at least six hours of sunlight a day and has well-drained, fertile soil with an alkaline pH of between 6.5 and 6.8.
  • Adding a few inches of compost or other organic matter to the soil will help improve its quality.
  • Because kale grows quickly, it needs 1 to 1.5 inches of water every week to keep the soil hydrated.
  • Consistently feeding your plants with a slow-release plant meal will maximize your harvest.
  • Consider an indoor water-based growing system for year-round kale nutrition.
  • As soon as the kale has matured to the desired color and size, begin harvesting it, starting with the lowermost leaves. Leaf flavor reaches its optimum after a mild frost has hit it.

Soil, Planting, and Care

To harvest kale throughout the fall and winter, start planting in late July and keep planting through the fall in zones 8, 9, and 10. In zones 8, 9, and 10, plant in the spring 3 to 5 weeks before the last frost. If you’re going to grow kale, make sure you buy starting plants from Bonnie Plants®.

Kale prefers full sun, but may grow in partial shade. However, even if a plant receives less than six hours of sunlight each day, it will still be able to produce enough food! Kale, like collards, thrives in rich soil, where it may spread quickly and have sensitive leaves. Before planting the seedlings, add compost and fertilizer to the soil. Follow the test results and apply fertilizer and lime as necessary. Before planting, add nitrogen-rich additions like blood meal, cottonseed meal, or composted manure to the soil.

Even if you don’t have an issue with clubroot, you need keep your soil’s pH between 6.5 and 6.8 in order to keep your plants healthy. Use a home test kit or contact your local Cooperative Extension office to verify your soil’s pH. Miracle-Gro® Performance Organics® All Purpose In-Ground Soil can be added to the top layer to increase the quality of your current soil. It will increase the soil’s texture and nutrition if it is enriched with old compost.

Kale can be grown in raised beds and containers, and it’s a breeze to get started. Organic Miracle-Gro® Raised Bed Filler creates the optimal growing environment for plant roots. Miracle-Gro® Performance Organics® All Purpose Container Mix is a soil and container mix for organics. Plants should be placed in the container at a depth appropriate for their growth. Keep a distance of 18 to 24 inches between each one. A lot of room will allow the leaves to expand in size, although smaller leaves tend to be more delicate. Wet the seeds thoroughly before they take root. Miracle-Gro® Performance Organics® Edibles Plant Nutrition, a water-soluble fertilizer, is a good choice since it provides plants with a steady supply of nutrients.

If you’ve planted your kale in the spring, you’ll have to wait until somewhat warmer soil temperatures prompt rapid development before it gets going. In warmer temperatures, kale planted in the late summer or early fall may suffer. Thereafter the plants will take off and grow rapidly when the conditions are better.

Kale prefers about 1 to 1.5 inches of water per week. In the garden, a rain gauge can be used to determine how much water has been delivered by the rain. Use a variety of mulches to keep the soil cool and wet while also suppressing weed growth, such as compost, finely ground leaves, weed-free hay, straw, or pine needles. Mulching also helps to minimize soil from splashing onto the leaves, resulting in a cleaner harvest.

You can even grow kale indoors if you choose. A hydroponic growing system, such as the Miracle-Gro® Twelve® Indoor Growing System, is a simple way to accomplish this. Plants thrive in water that flows about their roots, providing them with water, nutrients, and air. With the help of a grow lamp, this setup provides ideal conditions for producing kale. Even better, you won’t have to leave your house to gather your food!.


Kale is a relatively easy crop to raise, but there are a number of pests that enjoy it as much as humans do. Kale leaves are frequently chewed up by velvety green cabbageworms. Cabbageworms, the larvae of cabbage white butterflies, like to eat cabbage, broccoli, and cauliflower, rather than your kale, which they are less likely to trouble.

Harlequin bugs, which are black and orange, are typically found on kale plants that are in decline. Rather than combat the harlequins, most gardeners prefer to remove and compost old plants in the middle and end of summer. A row cover or some other lightweight fabric, like bridal net, is the best way to protect seedlings from these and other pests (like grasshoppers) in late summer (tulle). Late fall is when pest populations are normally at their lowest and the covers can be taken off.

It’s important to keep an eye out for the gray-green cabbage aphid clusters that form in the folds of frilly kale leaves. Insecticidal soap can be used on minor issues. Remove and discard leaves that have been infected.

Harvest and Storage

Like collards, kale leaves taste best when they’ve been lightly frostbitten in the fall. To remove any yellowed or ragged leaves from the bottom of the plants, select the oldest leaves. Continue picking up each plant until you reach the top, preserving at least four fully-formed leaves along the way (or growing crown). In zones 7 to 10, kale will continue to grow new leaves throughout the winter. A heavy layer of mulch, a row cover, or a plastic tunnel can help kale survive the winter in areas where freezing temperatures are common. It’s time to remove the overwintered plants and create room for new harvests when they bolt in the spring (producing yellow flowers). The leaves should be carefully washed and then placed in a plastic bag for safekeeping. You can either consume or discard the stems. The stems of the kale become more soft when cooked. In a loose plastic produce bag, kale leaves can be stored in the fridge for up to a week.

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How To Grow Kale In Greenhouse Successfully - Krostrade


Should I Harvest Leaves When They Are Young Or Wait Until They Grow Larger?

It all depends. If you’re planning to cook the greens, wait until the leaves have grown to their maximum size. Pick the largest leaves on the plant’s lower and outer regions. Protect the plant’s core by not picking or harming it.

How Long Can I Expect To Harvest Kale?

For a long period of time. Summertime harvesting of early-planted kale may result in stiff and bitter leaves. In moderate areas, plants can continue to grow even in the winter, and quality improves in the fall. Plants can withstand temperatures as low as 20 degrees Fahrenheit and even taste sweeter when covered in frost. They will, however, flee in the spring. Fall-planted kale is the same. One of Winterbor’s strengths is its ability to withstand freezing temperatures. Using a cold frame, gardeners in colder regions may keep their plants alive all winter long.

Is There Anything I Can Do To Help Kale Leaves Stay Sweet?

Kale can become bitter and harsh in hot temperatures. By mulching around plants, you can help keep the roots cool, which is essential for producing pleasant leaves. The flavor of the leaves can also be improved by making sure plants are kept well-watered.

I Picked Kale Last Week And The Patch Still Looks Sparse. Is There Anything I Can Do To Jump-Start Growth?

During the growing season, fertilize to ensure a constant supply of leaves. Compost or blood meal can be used as a side dressing on plants, diluted fish emulsion can be sprayed on foliage, or a liquid fertilizer like Bonnie Herb & Vegetable Plant Food can be sprayed on foliage.

How Long Can I Store Harvested Kale?

For up to two weeks, kale can be stored in the refrigerator. Store it in a damp paper towel in an unopened bag.

Frost Is Predicted. Should I Pick All The Kale And Store It?

kale is really made tastier by frost. A harsh freeze, also known as a “black frost,” can kill this vegetable in colder places, yet it is the most cold-hardy of all vegetables. As far south as zone 7, this plant will typically continue to put out new leaves well into the winter.

Green Worms Are Eating My Kale. Can I Spray Anything That Will Kill The Worms Without Hurting My Family Or Pets?

Kale is a favorite food of cabbage worms. There are worms in your garden if you see a white moth flying around the plants. Bacillus thuringiensis (Bt) can be used to control worms on kale. Humans or other wildlife are unaffected by Bt. Bt kills worms after they consume it. The worms may eat a few leaves after you apply Bt, but they’ll die within a few days. Spray whenever you see moths flying about your plants.

Final Thoughts on How to Plant Kale in a Greenhouse in Indiana

After learning how to grow kale in Indiana’s greenhouse, the next step is to get started. Having a little greenhouse for your gardening needs can make it easier to grow kale.