Return to the Growing from Seed Forum | Post a Follow-Up

Citric acid to aid seed germination

Posted by katskan41 (My Page) on
Mon, Dec 13, 10 at 12:57

Hello all. I've read a few articles about using citric acid to help germinate seeds with hard seed coats, like junipers. Directions I've read say to use a "10,000 ppm soak of citric acid for 96 hours" but they don't say how much citric acid to mix with water to get this 10,000 ppm solution.

Can anyone help with this?


Follow-Up Postings:

RE: Citric acid to aid seed germination

Hi Katskan,

Well, I'd say you need about one and one third ounces of citric acid to a gallon of water. Here's the way I figured it:

One US gallon of water weighs about 8.345 pounds (depending on the temperature).


A) 1 PPM = 8.345 pounds per million gallons of water.

B) Converting to ounces: 1 PPM = 133.52 ounces per million gallons of water.

C) Bringing it down to one gallon: 1 PPM = .00013352 ounces per gallon.

D) Going from 1 PPM to 10,000 PPM: 10,000 PPM = 1.3352 ounces per gallon.

Hope this helps.

RE: Citric acid to aid seed germination

Hello Art and thanks for the fast reply. Much appreciated.

So if I understand your calculations, I'd need roughly 3 US tablespoons of citric acid powder per US gallon of water to make the 10,000 PPM solution. Sound about right?

Thanks again.

RE: Citric acid to aid seed germination

Of course, to be perfectly accurate, it would depend on how much a tablespoon full of citric acid weighed. However, I'm sure the 3 tablespoons would be pretty close; that's probably what I'd use.

RE: Citric acid to aid seed germination

Thanks very much Art. Although the 3 tablespoons of citric acid per gallon of water might not be exactly 10,000 PPM I think it should be close enough for use on seeds with very hard seed coats.

Thanks again for your time.

RE: Citric acid to aid seed germination

I just heard about citric acid soak for germination for seeds. On the container, it says for sprouting seeds. My friend tried it on some almost impossible to germinate silky camellias and the seeds are germinating about 2 days. I would like to try it on some daylily seeds - has anyone ever soaked daylily seeds in this? Can anyone provide other information on this? I normally soak mine in a hydrogen peroxide/distilled water mix. Thanks for any advice......

 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!

Return to the Growing from Seed Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.

Learn more about in-text links on this page here