You can still use the seeding compost. It's really the same thing with a little more perlite to make it light and fluffy.

Hmmm, if you bought a compost that was just described as 'seed (and cutting) compost' then you would do better to upgrade to a multi-purpose compost. Seed compost is very low in nutrients as the baby seedlings cannot cope with a rich diet (similar to taking a human baby out for steak & chips). The potted on seedlings need something a little richer and will later be finally potted into an full growing compost. Multi-purpose compost is a middle-of-the-road compost that is not totaly suitable for any specific purpose but is an easy compromise.

if you want to reduce the cost you can use the seed compost but add some slow release fertiliser into it, or mix it with multi purpose to beef it up.

I would take a lesson from mother nature. In nature, all plants, trees and seedlings grow in the same medium.

Agree Bathgate but they are growing in the ground and how many seeds don't actually make it? In a pot a little more tlc is needed.

Her seeds have already sprouted. It's fine to use the seeding medium on hand instead of buying something else. Save your money.

Sorry Bathgate there aren't enough nutriments in seed compost, at least in the UK, if you want to use the seed compost, and I wouldn't, at least, as Seaburngirl says, add some slow release fertiliser. Compost isn't expensive and if you've taken the time to grow something give it the best chance you can.

I start all my seeds in potting soil. Though at the beginning they don't need the fertilizer, it doesn't seem to harm them. It's done really well for me so far, and this is my third year.

Ah so you don't actually use seed compost Bathgate, then it would make sense that you just continue on with the same compost... Growing alpines and bulbs from seed the mix has to be very lean to start with.