Is this eucalyptus mulch now aged enough to grow veg in?

Hi, this pile of eucalyptus mulch has been there for at least three years and underneath it's composted down and smells earthy and sweet, with lots of mushroom mould on it.

Can I use it for a growing medium with some aged manure mixed in or will it still bind nitrogen? I'm container Gardening on a budget so looking to avoid buying too much potting mix!.

Thanks in advance