Caring for Seedlings

It’s after the last frost (May 15th). You’re in garden mode. You’ve just picked up your seedlings, and it’s time to take the next steps. Which are… what, exactly?

Don’t worry, we’ve got you covered. From one Southeast Wisconsin-er to another, spring is as lovely and exciting as it is unpredictable. One cold night can zap 6-8 weeks of growth that it took to get your seedlings ready to plant. Likewise, a sudden temperature spike can easily scald tender leaves or roots while they wait to be planted. The best plan of action is to get your beds ready before the seedling sale pick-up date, and plant as soon as weather and time allows.

However, we know life doesn’t always allow for the best plan. If you can’t get your plants in the ground (or in pots) right away, check out these tips to keep your plants happy and healthy until you’re ready to plant.

Seedling Care Checklist

• Watering: Baby plants in tiny cells need to stay moist. They are used to being watered in the greenhouse 1-3 times per day depending on how sunny the conditions may be. The potting mix should feel moist to the touch. Keep a watering can handy, as the gentle showering pattern is easy on tender seedlings, allows for proper percolation to the roots, and won’t dislodge them like a blast with the hose will.

• Sun: Plants need light, especially if you are trying to size them up a bit before planting. While many houseplants prefer it, most of the veggie and herb seedlings will benefit from more direct sun than most windowsills can offer. MOST OF THE TIME, in Mid-May, southern-facing full sun spots outside are best, especially against a wall or fence to block the wind. We’ve already hardened-off the plants before they get to you, so they should be adapted to the day/night time temperature swing already.

• Pluck off any premature flowering you see. While many box stores often sell transplants that are in full flower, farmers know that you get better performance from plants when they are prevented from flowering before getting in the ground.

• Pay close attention to night time temperatures. Most of us are not outside at 1 AM, but the plants are. For tender annuals like tomatoes and peppers, you definitely want to protect them from temps below 50 degrees at night. That might mean bringing them in on a cold night. Here are a few ideas for backyard nursery set ups:

Please note that it’s just as important to check daytime temps, as the very thing that can protect plants at night may fry them if we suddenly get a 75 degree day! A cold frame or mini-greenhouse that doesn’t get opened may do that.

I hope that this has been helpful. Please let me know if you have any questions in the comments. Happy planting!

Written by:

Wondering how to store your harvest? Check out our Produce Guide, including tips for storage, recipes, and more. 

Want more veggies? Check out our local vegetable subscription (CSA) or find us at the farmers market to get we’re harvesting!