Sweet pot slips - too late?

[Suzie Q]

Does anyone know if it is too late to start a sweet pot in water to produce slips?  last year had T & M but arrived half dead and they never really did very well - no tubers bigger than my finger!

Thought I would get one from the supermarket but have I missed the boat?

Thanks
Suzie

[Suzie Q]

[manicscousers]

think it's usually jan/feb  :-\