Any focused N fertilizer works fine but with plants in containers yellowing leaves is more often caused by over-watering than nutrient deficiency.

If you want organic only then fish emulsion fertilizer given weekly works fine for me. if you don't require organic then Miracle Grow is probably the most common used. Container gardening forum offers many other recommended brands but they are all similar.

Since container plants, especially if in too small a container like most tend to use, require frequent watering, they also require frequent feeding.

Dave

ahhh overwatering.. that would make sense... I'll stop.. I was watering it more often than I should have because it started to flower. I'll stop. Thanks for the suggestion. I really need to buy some fish emulsion but I have some miracle gro that my dad gave me (I was too polite at the time to say I won't use it, my dad and I garden very differently).

I was debating on what other forum to try... indoor plant or container .. I'll repost on container.
Thanks Dave!

If the purpose of over wintering is to keep them alive, I would not fertilize them too much, I would not water them too much.
I will give them 1/3 strength fertilizers, mybe once a month.
I will also snip any bud and flower. They need light more than anything else. Keep them in cooler spot. UNLESS you want to have an indoor winter garden.