What Dutch Sources are you meaning Polly? Are you meaning buying directly from Holland?
Places like the Lily Garden grow, from what I understand, much of what she sells and of course hybridizes. Faraway Flowers (for example) as the name suggests, she brings them in from the outside and is quite up front about that (even her business name tells you this). Most of the lilies she sells are not grown in her garden, though Ramona grows many, many lilies herself. It is her love of lilies that brought about her business and to share her connections with lilies to us here in the USA.
I do think places like Faraway and B&D Lilies, you have a much better chance at getting what you are buying than say, Brecks or some place like that. They also back their lilies up to if you are sent the wrong one they will get you the right one or credit you. I will also add that most of what seems to be coming out of Holland of recent has not impressed me in the garden. Ots that don't withstand heat and succumb to virus more easily or just plain don't perform at all. These are lilies that pretty much have little resemblance to their greenhouse photos. As a person with passion the lilium, it is frustrating to see this.
So I go back to Judith at the Lily Garden and the small growers that create garden lilies and test them for years before releasing them. And hybridizing myself and trading seeds with you all
