blue gum does not require cold stratification. 6 weeks in the fridge shoud be adequate for the snowgum. after care depends on where you are if you are in a mild climate area and/or the last frost has already passed you can put the covered seed flat outside in a protected area with morning sun/afternoon shade. this late in the season you might be able to get away with taking off the cover once you see germination as the seedlings need good air circulation, just make sure that the soil is neither too dry or too wet. if you are growing outdoors be aware that snails and slugs (if you have those critters) love to eat tiny seedlings so you need to protect against same. good luck.