I live in a wanna-be organic farm. I have planted several seeds of pyrethrum for insecticide. All web sites say it loves plenty of sun, moist dirt and that's it. I live in Costa Rica, it's the rainy season, yet my little plants stop at one or two inches, and for now they are in potting soil. What factor is inhibiting their growth? Thanks.

Can you get or make protein-nitrogen rich compost to add to the soil?

Maybe more protein rich fertilizers, like corn or soybean, etc. ???