Thinking about a small diversification project and growing some daffodils for direct selling the bublbs to the public.

 Can anyone advice on where to go for information on bulb husbandry etc?

Could really do with knowing some general stuff like planting/harvesting times, expected yeild, fertiliser requirements etc.

Try

 Daffodils are one of the easier spring bulbs to grow, and have the added benefit of being unappetizing to deer, rabbits and other garden pests. ...
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	Bulbs and Cut Flowers By: Global Industry Analysts This report analyzes the worldwide markets for Bulbs and Cut Flowers in US$ Million. The major product segments analyzed are Roses, Lilies, Gladioli, Tulips, Potted Chrysanthemums, Orchids, and Standard Carnations. The report provides separate comprehensive  |  more...	10/1/2006	$3,950.00
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I have no personal experience however except that I have planted hundreds. I have never grown them for onward sale however.

I remember seeing a lot near Stonehaven about 20 years ago. There was a MAFF (as it was then) booklet about in the 1970s that gave general agronomic advice, and the then current costings, on growing many crops and I remember daffodils were included. See if you can find one - it had a dark red cover. I passed mine on when I moved to Australia. Since you are in Scotland, I suggest you make a trip to the North East and ask around for old blokes that have the experience (daffs are possibly still grown there).