I don't know how many of the "Super Databases" have hardiness zone criteria but I've found these 3 plus the standard one.

General Plant Info: "Minimum cold hardiness"

Heuchera: "USDA Zone Range:"
Iris: "Hardiness (zone temps are in Farenheit):"
Clematis: "Growing Zones"

Is there any benefit in labeling the 3 plant specific ones the same thing?

I don't know about the others, but there is a benefit in the Clematis and Rose databases because we're doing optimal growing zones rather than only the hardiness zone. In other words, there can be a minimum and maximum zone for growing both types of plants. So the hardiness zone for a Gallica rose is 4b, but the rose also doesn't grow well in zones above 8b, and that isn't covered anywhere in the general plant info.

OK. I think Iris is similar. At least JI may not bloom in higher zones due to lack of stratification.

I would love to see the maximum zone also. There are many plants and trees that won't grow in the warmer zones. Right now we don't have the ability to show that.

I agree with including maximum zones . The reason it is there for Heuchera is many will not survive above zone 8 or 9.

This is done. I have added a new field under the primary details called "Maximum recommended zone" and offers a pulldown where you can choose the maximum zone.

Thank you Dave.