I have a bunch of seed packets just waiting to plant.   I can’t resist them.  The pictures and descriptions look so cool.  I can’t wait until it is time to put them in the ground.   Then I read the back.  Some need to get going now, some need to be planted later, some in the garden soil, some in the greenhouse.  After sorting them I’m ready to go.  
One of my great accomplishments last year was to grow Dahlias from seed. What was your favorite thing to grow from seed last year?  Was it hard or easy? Was it veg or flowers?   The easiest thing I did was to throw leftover flower seeds in a rough bed and walk away.   Have you ever tried it?