Free Seed Starting Calculator and Garden Planting Calculator

A free seed starting calculator and a calculator to figure out your garden planting are just two of the free online gardening tools at the Johnny’s Selected Seeds website. Every gardener will find these charts and calculators incredibly useful.

seed starting calculator, organic gardening

Early season potato seedling

Seed Quantity Calculator

Whether you’re a farmer or a novice home gardener, this calculator will tell you how many transplants or seeds you should plant in each row. You choose the crop and the length of your row, click on “calculate” and voila! The correct number of seeds or transplants you’ll require appears. It also has a second calculator for larger plots and multiple rows.

Seed Starting Date Calculator

I absolutely love this one. At the top of the calculator you enter the potential last frost date for your zone – in my case here in zone 6, May 15. The chart then compiles the indoor seed starting date and the “safe” date to set the seedlings in your garden for the most common flowers and vegetables. If you don’t know your last frost date, check ourĀ last frost date guide.

 Click here for a free guide on planning and planting your fall garden

Johnny’s has also added How-to videos, a Fall planting calculator and a few other things you might find useful.

Thanks Johnny’s!

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About Todd Heft

Todd Heft is an organic gardener and freelance garden writer who lives in the Lehigh Valley, PA and has gardened for most of his life. When he isn't writing or reading about organic gardening, he's gardening. His first book, "Homegrown Tomatoes: The Step-By-Step Guide to Growing Delicious Organic Tomatoes In Your Garden" is available on Amazon now. Google

6 Responses to Free Seed Starting Calculator and Garden Planting Calculator

  1. andrea says:

    I just noticed on Johnnys site that the seed starting calculator is having some issues- I can’t view/print it as the left hand side is covered up by their shopping menu. I wonder why they don’t offer it as a downloadable spreadsheet like they do their other tools?

  2. Gus Illian says:

    This really answered my problem, thank you!

  3. Lucia says:

    Speaking of seeds and mild weather, I just came in from pulling dried pole beans off the plants. Never got around to doing it at the end of fall but really enjoyed this particular bean. I got the seeds at the New York Botanical Gardens. They are from Italy and have a great taste so I want to try and replant to see what happens. I replanted them last year and they turned out great. But this year since they’ve weather half the winter, albeit a mild one, the seeds I collected are smaller than what I usually see and some look wrinkly and have some white. on them. Do you think these seeds will successfully produce?

    • Todd says:

      Since the seeds were outdoors in the pods until now, I would think they’d be fine. There’s a chance that the “white” on them is a fungus, but that’s impossible for me to determine without a photograph. I would just plant them and see how they do – beans are incredibly hardy and usually thrive under the most extreme circumstances.
      What kind of bean is it?

  4. Vilma Santarsiero says:

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