Looking for Dahlia campanulata and dahlia imperialis Double white

[Kasun A]

Hello Everyone,

Does anyone knows a source where i can find Dahlia campanulata  and dahlia imperialis Double white.

i have Dahlia imperialis pink form which grew around 4m high in summer and now after the frost very unhappy.

if anyone knows european source please advice,

Thank you

best regards
Kasun

[Roma]

Try the National Dahlia Collection.  www.national-dahlia-collection.co.uk
They have campanulata and imperialis but not the double white.  Look under miscellaneous, they have a number of species listed there.