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Melager, can you provide more information about your growing conditions? How much light? What temperature? What is your mix? Can you take a photo? If seeds get moldy, it usually means they are dead. If good seeds are mixed with dead seeds and chaff, the dead stuff will rot, but you will eventually get seedlings.Here is a pot of Phyllodoce, a small plant related to Rhodies. (Attachment Link) The mix is peat/perlite/soil. Temperature is around 15C. They are growing under ordinary fluorescent lights. There is moss and mold growing on the surface, but the plants are doing fine. This happens all the time in nature also. Here is a closeup: (Attachment Link) I filled the pot with mix, then sprinkled a little peat moss on top, then sowed the tiny seeds into the peat moss, then sprayed with a fine mist of water.You should not fertilize until the plants have developed one or two true leaves. I find that fertilizer causes problems with damping off if the plants are very young. Fertilizer also speeds up the growth of moss.
I use propagation domes. See http://www.srgc.net/forum/index.php?topic=6490.msg320943#msg320943I have used baggies in the past. They work fine. But the prop domes are much easier and quicker to work with. Anyway, the baggies aren't your problem. I think your light source is your problem. Once you start growing under fluorescents, you won't want to do it any other way.
You can grow beautiful tomato and pepper plants under lights:
They're not the only plants that benefit, Gene! In my region we apparently have the most 'farms' per head of population ("Eee, it make you reight proud to be a tyke!"). http://www.bbc.co.uk/news/uk-17888762I've often wondered about getting some lights in the greenhouse but I'm pretty sure it would attract attention and a visit from both the boys in blue and the local scallies!
A few monthly energy bill driven bust ups in York in the last few years as well ....
Mix for most seeds: 1 part peat1 part perlite3 parts pumice (or perlite)1 part sandy loam garden soil1/3 part vermiculiteAdd a little dolomite lime, bone meal and Micromax trace element mix. I don't know exact quantities.Your garden soil may or may not be OK for seed starting mix. You will have to experiment.This is a coarse mix. For very small seeds, you should sprinkle some peat on top of the mix, and surface-sow the seeds on top of the peat.For very sharp drainage, add more perlite.For growing on, I use the same mix but with some small bark chips added. Room temperature should not exceed 15C for seedlings. If you are growing European alpine gentians and other very sensitive plants, less than 10C is needed, or the seedlings will die. For this, you can set up a fluorescent in your unheated garage, front porch, etc. You must protect against mice. They love to eat the seedlings.Another photo of the setup: (Attachment Link) Note that I use reflective panels to reflect the light back to the plants. This keeps them from stretching. White insulating foam panels are easy to cut.You can grow beautiful tomato and pepper plants under lights: (Attachment Link)