Coreopsis

[Palustris]

Coreopsis verticllata Zahgreb

Coreopsis Santa Fe

Coreopsis unknown

[ideasguy]

NICE one, Eric!
First class photos.
Were these taken recently?

RE: Santa Fe
Interesting - another new addition to the Master Database, thank you!!

I found this web page (a pdf document):
http://www.yoder.com/ASSETS/BB136E597BC04EFEAEB3E70D767B0CAB/08014_CoreopsisSantaFe.pdf 
SPECIAL FEATURES
Semi-double yellow flowers outperformed Coreopsis ?Early Sunrise? in our trials with better uniformity, foliage and flower-show ratings. Santa Fe? Yellow was in flower a week longer than ?Early Sunrise?. Showy, early summer flowers without vernalization, according to S&G Flowers.
Looks like a real good-un!
But, much more important, what are your comments?

[Palustris]

First of all the last one is probably a form of C. lanceolata.
Only had the Santa Fe one since early spring. I split the bought plant into 6. the 5 baby ones have grown well in pots and are just coming into flower, but the biggest one planted in the border has disappeared without trace. SO, I am wondering if it is mollusc food. Certainly the potted ones were badly attacked early on after splitting. I will try another somewhere else. Full sun, well drained soil and a bit of slug protection seem in order, otherwise dead easy.

[ideasguy]

Interesting how you decided to split the bought plant.
This year, Ive made a decision to do exactly what you have done here.
I'm fed up buying plants, planting them out, and losing them. I shudder to think the total cost of the plants Ive bought, and have disappeared/been devoured/been lost overwintering.
The plan?
Unless it REALLY reliable, to NOT plant out until I have a "backup".
I bought a lot of plants this year as plug plants (no time to grow from seed).
The majority, to quote your comments, were mollusc food
I nurtured them patiently, then planted them out. Within a week of planting, many were destroyed.
I managed to save the majority, by putting down slug pellets, but I'm so upset at the nice ones I lost 

Ive a few "backups" already e.g. Campanula carpatica (love them ALL). I have them growing them in containers.

The observation applies. If slugs eat it, its a good-un.
By that law, Santa Fe ^TM is worth a go! Thanks Eric.