African Violets and Gesneriads: strep babies not doing well. please help!, 1 by donnerville

donnerville wrote:
I am trying to grow streps from leaf for the first time and desperately need some help with the baby plants. l panted the leaf last October, using Miracle Gro potting mix. Maybe I should have used a seed starting medium or something finer than potting mix. Anyway, two leaves came out around last Christmas and a 3rd leaf came out later -- so I assume they are 3 different baby plants. These 3 leaves are about 1.5" to 2" in length now. So far, two of them have got the 2nd leaf. The second leaves don't seem to grow in size though (as shown in the picture). In the mean time, all the leaves have turned to a yellowish green.

What am I doing wrong? Do plants so small need to be fertilized? The soil is very shallow now, only about an inch deep. Is that too little soil for the plants? Should I pot them up? They are sitting by a sunny window. The day time temperature is in the low to mid 70F and the night time is probably somewhere in the 60s. The clear plastic lid is no longer on. The "mother leaf" was totally dead and I cut if off with scissors about a month ago.

Any advice? Please help! Thanks.