Hmm...it might give you something..but mostly I would recommend it for those who would work in industry...like gardeners, nursery trade, hard landscapers, groundsmen..
lot of it is hands on training with just enough theory to cover the actual work you are doing..
I know the qualification is shanged since I've done it... maybe you could pop in your nearest college for chat and ask to see actual theory material wether it covers your needs....?
I did mine in 1,5 years but that includes lots of different components..nursery, decorative, sport turf...and it all depends with how college arrange practical work
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I think it is based on minimum of 1 year as you have to do different seasonal jobs..