When can I put kale seedlings outside?

As a general rule of thumb, plant kale seedlings outside in late winter to early spring, as early as 3 or 4 weeks before your last average frost date. Seeds can be started indoors even a few weeks earlier. Protect tender young seedlings from hard frost after planting with frost cover or cloches.

When should seedlings be put outside?

You’ll want to wait until you have at least 3 or 4 true leaves before you consider transplanting. Work with your plant’s weather preferences. Understanding whether you’re growing cool-weather or warm-weather plants will help you determine when it’s time to start thinking about growing outside.

What temperature can I leave my seedlings outside?

If temperatures remain warm both day and night (at least 50 degrees Fahrenheit), the seedlings should be able to handle increasing amounts of sunlight and can be left outdoors overnight. Make sure the soil doesn’t dry out if temperatures should suddenly turn warmer.

How do you prepare seedlings for outdoors?

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How do you harden seedlings quickly?

An intermediate home, such as an unheated greenhouse or cold frame, is a great tool for hardening off. Place seedlings and plants into the structure for a couple of hours on the first day, then gradually increase the length of time they are in place by two or more hours per day.

When should you transplant kale?

You can transplant your kale seedlings up to 25 days until your first frost date to get “baby” kale, and about 50 days before your first frost date to get harvests of large, “bunching” kale.

Does kale like being transplanted?

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How long transplant kale seedlings?

Seedlings should be ready to transplant in 4–6 weeks. If possible, keep soil temperature over 75°F (24°C) until germination, then reduce air temperature to about 60°F (16°C). Transplant outdoors 12–18″ apart in rows 18–36″ apart.

How do you take care of kale seedlings?

Space kale 18 to 24 inches apart in an area with full sun and well-drained, fertile soil with a pH of 6.5 to 6.8. Improve native soil by mixing in several inches of aged compost or other rich organic matter. Kale is a fast grower, so keep the soil moist by giving it 1 to 1.5 inches of water each week.

Do you have to harden off kale seedlings?

The last week or so before transplanting kale, you need to harden off the seedlings. Basically, you just need to get them used to the outside temperatures, which are probably cooler than what they’ve been used to inside. Place the plants outside for a couple of hours a day to start off.

What happens if you don’t harden off seedlings?

If you don’t harden your plants, the tender plants will get burned by the sun, the shock of cold, or the wind. Some plants may recover from burn (even fully), but their growth will be set back a few weeks while they recover.


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