Let's talk about seed purity for a moment. There are two seeds you really need to be wary of: bermuda and bent. Unless you want a bermuda or bent lawn, these are considered very aggressive weeds. The really bad thing about them is that their seed is the size of dust while "real" grass seed is more like seed sized. When you have contamination of TTTF seed with bent seed, it does not take very much bent grass seed dust to over shadow the TTTF seed in actual seed count. When they make the seed bag or box labels, they measure by weight. So when you see a box labeled 99.9% TTTF (whatever variety) with 0.10% Weed (or Other Crop), you could be buying a bag full of bentgrass seed simply because the weight of the bentgrass seed is so light. So when you find a seed you want, look for a supplier who will guarantee 0.00% Weed AND 0.00% Other Crop. You will not find this purity of seed at Wal-Mart. You will only find this seed at better garden stores and nurseries. You do get what you pay for in seed purity.

I don't want to give a headache in trying to select the right type of bluegrass seed for your lawn to mix with fescue. However, I do want to offer food for thought. First thing is to always select the best seed possible. Another is to take your growing conditions into consideration. If you have shade, more thought goes into the bluegrass selection, depending on how much sunlight the area receives. And another thought is the color of your fescue lawn (or the new fescue seed you're planting), so as to try matching as closely as possible. Furthermore, consider any diseases you have had in the past or any that are common to your area and select resistant varieties. Most likely, relatively newer or improved varieties will offer the better disease resistance in general. One last things I can think of at the moment is growth habit. When mixing (or blending) species, you want to ensure uniformity by selecting all varieties that grow and tolerate mowing height much the same. There are lots of fescues that grow slowly and can be mowed low and many bluegrass, too. But, many fescues don't and many bluegrasses don't. The best idea is choose similar maintenance requirements as it relates to mowing frequency and height.

Clear as mud?

I'll answer your questions individually if you still wish.

Thanks dchall, that is a very good point. One of the reasons I went to Lesco this fall was 0% weed seed.

Thanks bestlawn. All very good points. I think the advice to select the best seed possible is very good advice, even though my nature is to find "good enough" at the cheapest price. How does one go about matching growth habits? Is it a generic low, medium, high trait that is published or ??

The producers have descriptions on their websites to tell of each variety's traits and characteristics. Most wholesalers and retailers supply descriptions on their sites also. If you have trouble finding what you need, I can usually locate most of them. Just let me know.

To get you started, here are a few producer sites....
Pickseed
Turf-Seed, Inc. (now owned by Scotts)
Jacklin Simplot
Seed Research
Turf Merchants

There are several others, but this is a good starting point. Note also there may be some varieties not listed on the producer's website.

Oh, bestlawn! You didn't warn me that there were "types" of KBG, LoL. Compact, Midnight, BVMG, Mid-Atlantic..., what is a layman to do! Should keep me busy over the winter trying to make sense of the vast number of bluegrasses. Thanks for your links.

I didn't mention it because it's most important when blending bluegrass and much less important when selecting just one bluegrass variety to mix with fescue. You only need one, so you don't have to be concerned with the different types. The objective is to blend for diversity. You're not blending, you're mixing species. Can't get more diverse than that.

Thanks bestlawn for the list of producers!
It is hard to choose the right one...

Could you please provide with a list of the most popular and the most trusted lawn seed producers especially from the north part of the country or from Canada?
It would be highly appreciated

Samokhin--GW banned bestlawn a few months ago, so she no longer posts here.

bpgreen, I've seen you post that a few times recently. What exactly was she banned for, and by whom?

By Gardenweb. I don't know what she was banned for. I know it was something that happened on one of the other (not lawn related) forums. I think they removed the thread that got her in trouble.

Yeah, I was just meaning banned by a moderator of GW. She must have done something pretty bad to actually get banned from the forums, I would think anyways. Unless she was trash talking against GW, or doing something against the rules, I don't see why she would get banned. I searched around and someone said it was because of a disagreement in a debate, which if this is true, is pretty unfortunate.

Thanks bpgreen!
That is a shame... Bestlawn did quite informative posts.

Could someone, please, answer my question?

It is too hard to choose the right brand name of lawn seed producer or a reputable seed house..., especially if the subject is unfamiliar to you (it is for me). Anyway, it seems better paying a few extra cents per pound for good quality seed than trying to maintain an attractive lawn that was from poor quality seed...

Could someone, please, give a list of leaders of the lawn seed market in the north part of the country or in Canada, the most trusted producers, brand names or reputable seed houses? Just to go and buy with certainty that you are not going to have troubles with your lawn. That would be highly appreciated!!! Thanks a lot!