Blue Fortune? Mine is a bit less than 3’ high normally.

Black Adder too tall, Little Adder too small, where is Medium Adder? (breeding opportunity here..plus Goldilocks reference)

Are you defining "weedy" as any level of reseeding? I was going to recommend the straight species A. foeniculum, which fits your other requirements, but it does re-seed a bit. The re-seeding certainly doesn't come anywhere close to what I would consider "weedy", and the seedlings are very easy to remove.

I agree about 'Golden Jubilee' reseeding a lot, though a great looking plant and especially good for very cold zones, seldom has it winterkilled for me, can't say that about other varieties.

Maybe Blue Fortune would fit the bill, with the added convenience of being available locally. Dbarron, I was thinking of Goldilocks as I typed my post :) I was hoping Little Adder would be more medium sized, but it's only about 1' tall for me. Sah67 I have a pretty big property, not huge, but keeping up with weeding is enough of a challenge already, so I'm hesitant to plant anything that will reseed. I'll look into the species though and maybe try 1 and see how it does. FrozeBudd, are you sure the mother plants are surviving and it's not just new seedlings taking their place? One problem I've seen is that we will get some early spring warm spells and things start growing, and then a cold snap will zap them. Maybe in your colder zone that's less of an issue?

-Chris

I’ve had Blue Fortune for several years and haven’t found it to be a reseeder. I have it in three separate areas of my garden and the only issue is with the one where it is wetter.

Gorgeous, Frozebudd! Which hydrangea is that behind it?

Thanks Emily, the hydrangea is 'Little Lamb', it's now a much larger specimen and last year must have carried 120 blooms! It requires good moisture to avoid flowers from browning off prematurely.

I agree "Gorgeous, Frozebudd!" So did you try 'Blue Fortune' and did it winterkill?

It came back here for 1 year and died the next, not a single plant but 6 (3 in 2 different locations that should have suited them.) I have good snow cover. Pity because I liked them.

I have not grown 'Blue Fortune', though 'Blue Boa' had perished in its very first winter. Years ago, in an isolated woodland setting nearby to my home, I came across what I believe is a native agastache species with spikes of blue blooms above small shiny NON fragrant foliage on stems about 3 1/2 ft tall, rather a good looking thing! Though, once planted in my garden, it became an aggressive seeder with longivity and persistence of those darn seeds! I'm unsure of the species, it does not appear to fit the description of foeniculum, as it has zero fragrance of foliage.

Blue Fortune is tough as nails here. Long blooming and a Bee magnet!

FrozeBudd, I recall seeing several beautiful rudbeckia photos you had posted in the past, huge stunning blocks of them!

I’m looking at trying a mass planting of A. Astello indigo. I have blue fortune and like it, but this newer version seems to be improved and can also be bought from seed.

Chris209, if you're still around, here's the 'Golden Jubilee' having successfully over wintered as they generally do in my zone 3 / 4 garden with long snowy winters.