Whatever it is, those are absolutely beautiful!

They where all small when planted. The sizes are indicative of their size last year - thought I give a year but same size results this year. I may end up trashing the tiny ones (there are more) and split the larger ones. Would be nice to know if it is Marcus or May Night though. Can Marcus get 16 x 20?

I have NO experience with Marcus. In another thread concerning a popular hosta a gardener mentioned that she believes some bad tissue cultures are possibly responsible for the plant not growing as advertised. I have a Veronica that is to this day advertised as growing to 18" tall. The first year it was planted (the year I purchased it), it did indeed stay 18" tall. For the three years afterwards, it has reached 3' easy. I have searched and searched the web for an explanation as to why it decided to double in height to no avail. I would guess at least 95% of the time plants behave as expected, but there seems to be the occasional specimen that just will not grow as advertised. I have May Nights and Baths Pink Dianthus purchased from two different nurseries. The May Nights are not the same purple, nor are the Baths Pink the same shade of pink. I've never gotten an explanation.

I will say that the coloring of both the purple flowers and green leaves are INTENSE in that photo. Would love it if my May Nights had that intensity!

What size are your May Night?

I have very dry soil which may impact the color. Here is another pic - perhaps more representative. Notice the splaying and with very little rain.

Mine are the advertised height, 18-24". According to The Missouri Botanical Gardens, one of my favorites sites for info, splaying is expected in some conditions. Yours look to be about 2' tall, which is normal. Am I seeing that wrong?

Whaas those are very pretty..love the deep color! From your pics they don’t look like ‘may night‘.

Here is may night to compare with...

another group up closer