I have been admiring tall phlox and found some at a local nursery. Any way to make them clump up faster? These look pretty skinny just one lone stem, but at least I have starts of the white (David) and a purple.

Tall phlox do spreead easily,just be patient.
This is my David in 2009 just planted,its next to the steps



In 2011



The rest of my tall phlox were planted 2 years ago and are nice clumps
Flame purple this pix was 2013



Flame purple this past week

do they seed?

I dont believe they do.

Thanks, I will try to be patient. I drove by a house the other day and the lady has a clump of an odd lavender color. I almost stopped and asked could I trade her a plant for a start lol. I am going over the edge!

Some of mine reseed. But don't necessarily come true

do they bloom for very long?

That is good to know Jennifer, I will keep some of the mulch back a bit.

Mine do seed and the clumps get bigger every year. If you trim off the spent blooms they will bloom for quite awhile.

Mine start blooming in early July and with dead-heading go on until end of August.

Teresa - Please consider going back and asking the owner if you can have a piece of the phlox. It's a great compliment to the owner!

My phlox just expand and don't seed at all. I bought four (three of each) from Blooming Bulb in early spring and was shocked and delighted to see them blooming already. I didn't take photos of the phlox shown here. They're just to show me where I planted each of them.

Mine have gotten so big that it's covering a small hydrangea! I'm going to have to move one or the other before next year. When is a good time to move phlox?

When they go dormant in fall or very early spring - like early April.

Pirl, those are beauties.

Thanks. They all seem to have the correct colors - no playing around.

Arlene, I might stop. I know the lady's son from a long time ago , so she is not a complete stranger.

Good - you have an intro. Even if you didn't I judge by how I'd feel if someone asked me and I'd be so happy to share.

I LOVE phlox. I planted several way too late last yr and they didn't make it. I'm gradually finding replacements. I have a 4 ft tall pink phlox that the swallowtail butterflies adore. It starts blooming in late June for me and keeps going until I get tired of it in Sept/ Oct. It's also fragrant.
@pirl Arlene, your Franz Schubert, are the individual blooms as large as they seem? I had wondered about that one.
I have ordered 5 new plants from Perennial Pleasures in VT. They specialize in phlox.
@ge1836 awesome clumps!

I'd say the individual blooms must be 5" across.

Pirl, Does the Franz Schubert flop with those large blooms?