Germinating seed issues

[Jackaroo]

I have gone 3 for 20 on starting seeds using various methods: paper towels, root riot, peat pellet, all with a sprouting heat mat. I get a small tap root, 1/4 -3/8" that is tight to the seed body then it stops. Seeds are from 2 different stores. All of my tomato seeds that were next to them did great. It has got to be something i'm doing. Thanx in advance.

 

[MysticMimi]

Perhaps you did not see the excellent responses to your previous post?

 

[Jackaroo]

To my knowledge this is my first post. Tried yesterday but did not upload it.

 

[SoOrbudgal]

Well it's the second post same subject and received your answers Jackaroo