I bought a cell pack of basil seedlings from a local reputable nursery here in Berkeley, and planted all of them; the first three in a window planter (w/ cocoa fiber lining) and the other three in separate clay pots outside. Three months later, those I put in the planter have neither grown nor died - they've basically just stayed the same size (might be 15% larger than when I bought them.) They don't look particularly healthy or unhealthy, but have been very slowly getting a little more yellow and sickly looking. The plants in the pots outside have grown a little bit more but the leaves are yellowish.
The planter set gets about 6 hours of full sun and 6 hours of bright reflected sun. The ones in the pots get full sun all day.
The soil mixture was a combination of Uni-Gro potting mix, compost, and perlite, with some agricultural lime thrown in. I've never seen a plant behave this way before - surely this is a result of something other than transplanting, since it's been so long. any ideas?