Scallions sowing

I sowed purple scallions (seeds) in April. Uptil now I can't see any growth. I water regularly and also sprinkle compost and animal fertilizer every 2 weeks ( photo attached). Should I be positive that it grow?

 

I think I'd sow some more seed in another patch, water them in and then when it dries out. I wouldn't apply fertiliser until they are growing and then only the once.
I don't really understand the sprinkling with compost?

 

One might expect fresh onion seed to germinate within 2 weeks indoors but may take longer if outdoor soil temperatures are low; that is below 15deg C. Aspect and depth of sowing will affect this.
Onions require soil which is rich in nutrients; ideally prepared before sowing. Addition of chemical fertiliser on to seed is unwise and could affect germination. Without knowledge of the conditions it is only possible to recommend trying again, with fresh seed. The originals may yet surface !

 

Thanks. I'll get some more seeds as they can still be sowed until June. So should I put in same patch as garden space is limited? I'll put compost first (upto 3 inches) n then put seeds 1 cm deep!

 

Yes, agree.
If you had modules or small 50mm pots, sow 5-6 seeds together and transplant 'as one' in groups 75mm apart. Slugs may graze new seedlings although onion is not a favorite.
EDIT
Many varieties of spring onion(scallion-US) are frost hardy to -2 deg at least and can be overwintered for use in early 2026 from a later sowing. Once established as transplants, they will enjoy a nitrogenous liquid feed.