I'm growing from seeds the nice Mudgee Wattle (Acacia Spectablis) and I would be grateful if someone can advice me about the most appropiate fertilizer for it.

Thanks!

I'd err on the side of caution with these plants and any fertilisers.

They are growing slower than expected (maybe I sowed them a bit later than desirable) and I supposed that they would need some fertilizer.

Regards from Spain.

I am sure you do not want to be responsible for unleashing an Australian native environmental weed in western Europe.

Go to my website and follow the 'Environmental weeds' link on the left hand side. This will give you some idea of the damage that environmental weeds can do to the local environment whether it is in Australia or Spain.

I actually live in Mudgee, home of A. spectabilis, and I can tell you, they're a rare commodity even here...doubt that they'd be an environmental weed anywhere (although I do agree with your general advice!)

I remember Peter Olde saying that this one is in his top 3 of all the Acacias for beauty (from around 1200 species), and I can vouch for that. ("Spectabilis" means "showy").
I've managed to kill 4 or 5 before getting one to grow...

For more info, see this site.

Regards,

Shax