I'm in 4b MN. It's a gorgeous lily. Mine gets to around 6+ ft. It always draws comments and questions from people. At least in my garden, it's been EXTREMELY slow to multiply. After 5 years in my garden, I finally saw the first baby coming up near the mother last summer. So if you really want an impact I would suggest you plant at least three right away.
As for a source, I've been very pleased with bulbs I get from The Lily Garden.

I have 9 of them in my garden. They are over 6 feet tall, but so top heavy that they lean sideway like a drunken sailor ..the better for me because I can see them from my 4'10" height. lol Could be because they don't get afternoon sun anymore since my neighbor has added the second floor and raised his roof.

I got the first 3 from Park's, the remaining from the Lily Garden. I can't remember if Buggycrazy carried it or not, but it's worth a try.
After several years, I finally saw two babies last year. I hope they will bloom soon.
L. ÂSilk RoadÂ:
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It is a lily hall of fame plant.

I have Altari also an OT. In comparison I prefer the uniform petals of and fragrance of ALtari. It so love the fragrance!!! Altari also seems preferred among my garden visitors.

so maybe get both! lol!

I got my Silk Road from 2 places. One might have been from woodthrushes co-op. The other I believe was a replacement for a misorder. I think that one was from the lily garden. It is so common I think I might have also seen it at walmart.

Altari is harder to find. I think that was from woodthrush co-op. ( GW member or was...)

I have a lily album of 64 varieties in photobucket. There is a link from my post on it on this page of GW.
:)

Loved it. Gorgeous, big, and fragrant. It loved my Michigan garden but hasn't done anything here in dry hot Colorado. You should be fine. I got them from Lily Garden.

I love SILK ROAD. Mine were new last year. I bought bulbs from White Flower Farm but they were so bad that I had to re-order from the Lily Garden. Get them from the Lily Garden, they have wonderful bulbs.

I got ALTARI too, maybe from Brent and Becki's. Altari did not bloom so can not wait to see it this year.

I have several Altari too, but they don't set my heart aflutter like Silk Road. I find Altari too dark and gloomy because it's much darker than Silk Road.

I have Triumphator which is very similar to Silk Road. Amazing Lily. Wonderful performer. Multiplies like a pair of healthy rabbits in my garden.
Planted 1 bulb of Silk Road last fall. We'll see...

Thanks for the info on Triumphator, good to to know it multiplies rapidly.

Love Silk Road too but I also love my Pink Perfection and African Queen

Silk Road and Leslie Woodruff both multiply like weeds here. I have given many away to friends. the Lily Garden is the best place to buy I have found.

flowergirl70ks, I'm getting a case of zone envy again as I'm guessing it may be my shorter growing season that keeps it from multiplying.

After 3 seasons I have to dig up the lily garden to move away. The silk road had multiplied like rabbits for me too. I must have 20 little ones off of 4 mature ones. I am in zone 5a.