Bitter melon seeds not sprouting
I am having trouble sprouting Indian Long green and Thai long bitter melon this year. These seeds were acquired from a commercial seed company. Seed pack says packed for 2010.
Has anyone grown these varieties? Are these hard to germinate?
How long do they typically take to sprout?
I started a batch during the last week in April- indoors on a heating mat - No sprouts. Another one around mid May - no luck. And one more batch 10 days ago - no sign of life yet.
My method is to crack the seed coat a little, soak them in water for couple of days and sow them in seed starting mix.
On the other hand, another variety - Delica Thorn sprouted within a week following the same method. What gives?