I'd choose Promix, and I wouldn't add anything to it but fertilizer. The other mixes could cause problems with moisture retention in an Earth Box because of the organic additions. And they are unreliable nutrient sources in any container, so you'd still need to fertilize.

There really isn't any shortcut to this. You need to repot everything with fresh potting soil. You do not necessarily need to move each plant into a larger container but you DO need to replace the soil. Potting soil degrades, compacts and loses its ability to drain quickly over time. The fact that you think you need to add soil to the top of the containers is clear evidence of this. As is the state of the plants growing in it - they are suffering. While I wouldn't ordinarily recommend it, even the cheapo potting mixes available at places like Walmart or Home Depot are better than what you have now. At least for this growing season. Consider it an investment in your plants :-)

Hi all, I am trying to find out the best potting mix for curry leaf plants.. I have few of different sizes from 3" seedlings to 8" plant.. I came across may mixes like 5:1:1 mix, 5:1:1 gritty mix, ready made potting mix(personally used supersoil potting mix & kellogg potting mix). Could you pls share your experiences with what worked best for you. I'll start with my exp. My experience. Earlier we use to live in bay area(Cupertino, CA). I have made my own mix with peat, perlite & compost(1:1:1). I also use to regularly feed my plant with fish emulsion & some Vermicompost & this gave me a good success. Now, we moved near LA(Torrance, CA). Here our temp doesn't go up much(look like not much above 90's during peak summer & evenings are cooler). My que is will the same mix I used wotk for me.. I am bit curious to try al's 5:1:1 mix if it rill work for my curry plant. As I gave away bo my big trees, I am really missing them. I really want these babies to grow faster.

Soon as the ground is warm should be good, always mix the vc in under the soil dont leave it lay on top.