Posted: 15/03/2013 at 13:24
I now always grow my dahlias in big pots. They just dont survive the slimey army in my soil.
Agree, biggest pot with good compost- JI3 type- plus food pellets/regular feeding over the season. Water gel added to the comopst at planting time too stops potential drying out- even in a season such as last yr.
Get supports in place fairly quickly otherwise a strong wind can do damage before you realise.
I dont have too many earwig problems, but do find some varieties are more suceptible to slug attack than others, even in the pots. I use copper tape/strips around the pot/plant stem of those I really wouldnt want to lose.
Mine are now starting off in the house- some on a sill, others in front of the patio windows. Any MP compost fine for that & yes, you'll need to repot a couple of times for the biggest flowered/tallest varieties. J.