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

 o
Geranium starts turning yellow

Posted by JR4094 NE (My Page) on
Sat, Mar 1, 14 at 10:51

I have always started my geraniums indoors under lights with a heat pad. For the first time, they are turning yellow and some are dying. I have always had excellent success in the past. What am I doing wrong?


Follow-Up Postings:

 o
RE: Geranium starts turning yellow

Hi JR,

Sorry to hear about the problem you’re having with your geraniums. Actually, without more information (and maybe a photo), it will be hard for anyone to offer any really significant suggestions.

How old are the geraniums? What kind of growing medium are they in? Have you been careful about not over-watering them? Have you added any fertilizer and if so, what kind and at what strength? What kind of lighting are you using and how far are the plants from that light? Any information like that would be helpful to those wanting to help.

Art


 o
RE: Geranium starts turning yellow

I use T5 grow lights in flats that have a wicking pad for watering. My soil is a mixture of vermiculite, perlite, peat moss. I haven't really fertilized them much. These are about 4 weeks old. In past years they are usually lush and green. I have lost my touch!


 o
RE: Geranium starts turning yellow

I use T5 grow lights in flats that have a wicking pad for watering. My soil is a mixture of vermiculite, perlite, peat moss. I haven't really fertilized them much. These are about 4 weeks old. In past years they are usually lush and green. I have lost my touch!


 o
RE: Geranium starts turning yellow

JR

Actually, from the photo, they don’t really look too bad :-) However, your growing medium (vermiculite, perlite, peat moss) contains no nutrients, so adding at least some water soluble fertilizer would probably be helpful at this stage. Usually 1/4 or 1/2 of the recommended dosage is used for small plants like this.

Your T5 lights need to be about 3 or 4 inches above the plants. T8 bulbs can be kept closer than that but T5’s do get a little warmer so you have to be careful not to get so close that they can burn the plants.

If you’re pretty sure the wicking method of irrigation is not keeping the medium too wet, I’d suggest adding a little diluted water soluble fertilizer. These plants are a pretty good size so I’d probably use something like about 1/2 strength of 10-10-10 or 1/4 strength of 20-20-20.

Just my opinion of course, hope it helps,

Art


 o
RE: Geranium starts turning yellow

Yellow leaves are normally due to too wet of soil, or plants in need of fertilizer. Judging by the chlorotic appearance of the yellow leaves with green veins, I'd guess they need some fertilizer.

Deanna


 o
RE: Geranium starts turning yellow

I have grown geraniums for years and I've seen plants that look like yours before and I know it's from keeping them too wet.

Those ones that have red leaves probably have blackleg and are rotting from too much water. Your mix might be off this year and holding on to too much water. Turn off your drip and let them dry out before you lose them all.

Always err on the side of keeping geraniums too dry. They can stand periods of no water but too much is a death knell


 o
RE: Geranium starts turning yellow

yeah someone already said it but i water my seedlings with either a 25 or 50% water soluble organic fertilizer if you want to do it every watering give them a 25% if you only want to do it once a week then do 50% strength. I invite you to join my youtube channel and ask me question watch my garden vlog and general how too's.

Here is a link that might be useful: TheItalian Garden


 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