Thanks again for the comments!
Yes, flower ponies' hair vines are rooted in ^_^
I used 28 gauge green coated nickel florist wire folded in half and pushed through the hair holes to catch the vines and pull them in tight.
Foxgloves are gorgeous flowers! They remind me of the film
The Mirror Has Two Faces.
I promise I will use them at some point, there will be many more flower ponies in my future ^_^
I'd also like to try doing one in all blues and purples, and one with lily of the valley.