I started tomatoes, a variety of peppers, onions and cucumbers from seed in the house. I planted them all about 3 weeks ago. The cucumber and cherry and beefsteak tomatoes are doing great. Nice tall and green. Onions are coming along but the peppers are lagging behind. Barely breaking the dirt. I give all alittle water at the same time and they are all kept at the same temp. Are peppers alittle slower to grow from seed or do they need something different then what I am doing? Any suggestions? Thanks!
Make sure the soil temperature is around 85-90 degrees and keep a humidity dome or plastic cover over the germinating seeds. You can buy a "Jiffy Propagator" and you can put a heating pad beneath the propagator. If you germinate the seeds this way, you will have seedlings emerging in 5-10 days, works for me. I don't use peat pellets because they tend to dry out way to much for germination, keep the soil constantly moist as well, if the soil gets to dry your pepper seeds will not germinate (that is what the humidity dome /plastic cover is for). Hope this helps.
Also, you probably already know this, but just in case, make sure those peppers are not planted next to the tomatos. That could also be slowing them down...and...more importantly, they won't produce peppers.