When to harvest Plantago lanceolata (narrowleaf plantain) seeds

[PA2019]

Living in Florida I have a ton of plantain popping up around me right now. The plants grow in my outdoor pen but my stars always annihilate them before they go to seed.

I want to harvest the seeds and grow some indoors year-round using the Kratky hydroponic method, but I am unsure when to harvest the seed stalks.

Do I look for stalks that are very dark and dried up, or while there are still flowers on the stalk?

Here is an example of the variety of stalks that I found this AM.

 

[Tom]

I collect mine after they dry out and are no longer green. I don't know if this is the "right" way to do it or not. Its just what I do and it works for me.