"Dave Hill" wrote in message
...

On Nov 17, 9:28 am, wrote:
In article ,

Bertie Doe wrote:
/If ytou havn't divided the tubers in 5 years I'm not supprised they
/are not growing as tall as they first did.
/First year you probably had 2 or 3 shoots, now you are probably having
/getting on for 20..
/If you think, with herbacious plants when you divide them you take off
/younger growth on the outside and dump the Old middle,
/With large clumps of dahlias split them, possibly using a spade to cut
/them up if they are realy large, select the tubers with the younger
/stems, you will find old and dead stems and tubers, dump them.

No you are correct, I haven't divided them, although the odd one falls in
two, which gives a bonus new plant. When should they be divided, now or in
the early spring? Thanks.