Where's your plant sitting? Part of the problem may be simply that they're not getting enough direct sunlight to green up and grow more, especially indoors during winter.

Light green with dark veins usually means chlorosis (iron defficiency, kind of a plant version of being aenemic). If you can find an iron fertilizer like Ironite or straight ferrous sulfate, give it a light application.

I'd also switch to Miracid but use half the recommended strength, and don't fertilize every time you water; gardenia roots are delicate and young plants are especially sensastive to too much fertilizer. You might also try flushing the pot by watering until the water runs freely out of the bottom of the pot once every few weeks, to prevent fertilizer or salts in the water from building up.

Finally, light green leaves may also mean spider mites, look under the leaves for tiny webs where the leaves join the branches, hose 'em off frequently if they're present.

If all else fails, you may still have to call in the reverend/rabbi/imam, but we'll keep our fingers crossed!

Jim

Heath, don't know if this will help, but every three months I add Iron Chelate/Sulphate to gardenias, and a few other plants..
I can't tell by the pic, but your description sounds like chlorosis..lack of iron. If it's not an iron defincency, and you add iron, it won't harm your plant as long as you follow container directions..Some plants require extra iron: gardenias, azalea, citrus, ferns..and many more.
Epsom Salts will help too, but only if magnese/magnesium is lacking..Those who use ES's swear their plants look 100 times better, greener than before use. I recently tried it, for the first time, but it's too soon to tell.
Good luck, Toni

ditto on the iron, that's your problem

Question on the Epsom salts. I have seen this before, but how much and how often?

Thanks

I'm absolutely no expert, but from what I've read here and elsewhere, I used one teaspoon in 3 quarts of water. That highly diluted, I figure it couldn't be harmful. I drenched it once two weeks ago. It hasn't done much, but it hasn't killed the plant either.

I'm waiting on some iron to be shipped as local stores don't have it - even the Home Depot!