I've got a yellowing problem with my cauliflower seedlings that I've never seen before. There's a four-pack each of Amazing and Snowball X (different seed vendors) and among all the brassica seedlings I have going, these are the only ones with this problem. The leaves look somewhat chlorotic, hungry with mottled yellowing and leaves are cupping. They have been fertilized with a little Miracle Grow just like the other seedlings and watered at the same time as the others. The starting medium is the same as the others and they are not rootbound.


The edges of some of the small lower leaves are crisping up.


Does anyone have any experience with this or insight into what the problem could be? Cauliflower is about to be booted off the island after this season. It's usually the whipsaw temps that make growing cauli pretty problematic but now this too. I can use the space for something else.

The first four that looked the same were planted out this week on Thursday so I guess I'll see if that helps or not. Any help would be greatly appreciated!

Seem to be recalling something that may indicate Boron toxicity, not 100% sure or maybe a Molybdenum deficiency. Not really useful but inclined to think the former. Too many years ago and we were playing with ornamentals not food crops.

I have never had this happen with cauliflower, but it sure looks like an iron deficancy. I guess that I would give them some nitrogen, iron and magnesium just to cover the possibilities.

Have not seen that before. Super annoying though.

One other thought on this. Could it be mites?

Well now, that's a thought. They've never been outside of the house but you never know. I just checked them thoroughly and there's no evidence of mites. But thanks for that thought anyway!