Capillary Matting ?

[geepee]

I bought 2 window sill propagators on recommendation from another thread.(Thanks Dinno)
Well impressed with the contents .
I have sown Onion seeds in them and they appear to be doing well, sown on 31/10/17 germinated in 10/12 days and now 2.5/3'' high.
Still in the prop' and under Lights.
However, I did'nt put the Capillary mats in ..!!!!
(So keen to get em started !!)
Question is .....will I put mats under now ?
Do mats make a difference ??
GP

[veggiechicken]

Capillary mats help with watering, hold water and its absorbed by the seed trays above. They're not critical, just help you to water less frequently.

That's my version of it anyway!