Dahlia Pot Tubers
Most growers use plants surplus to planting requirements for this purpose. It is a most useful way of utilising either early struck cuttings which have become pot bound, or late struck cuttings which are unlikely to produce flowers before the frosts. It is advisable to put aside at least one or two plants for this purpose just in case anything does go wrong with the large tubers.
If neither frame, substitute frame, nor space in the garden can be found, a bed can be made up on a pathway or concrete surround by standing loose bricks on their narrow side to form a rough rectangle, of the required area.
This show is, of course, staged by the National Dahlia Society, which is the premier society catering for the dahlia in the British Isles, with members in England, Scotland, Wales and both Northern Ireland and the Irish Republic.
Among its activities it makes available all known information on the dahlia, gives advice to members and affiliated societies, maintains a national register of judges and lecturers and co-operates with similar societies in other countries. Covering, as it does, an extremely wide area, there is a Northern Committee, which looks after the main interests of members north of the Trent, organising at least one provincial show, and staffing bureaux at the bigger Northern shows.
The rest of the treatment follows similar lines to that recommended for the more usual pot culture. It is even possible to grow them in a completely sterile medium, such as sand, or fine aggregate, watering with one of the complete fertilisers recommended for soil-less culture.
Alternatively they can be completely buried in the soil, with the top of the pot about i in. below the level of the soil. Again it is advisable to lighten and enrich the soil into which the pots will go as roots will find their way into this during the summer to obtain some nourishment. Plants grown in this fashion will not require watering at such frequent intervals as they will obtain a large proportion of their requirements direct from the soil. A slight disadvantage is that the expanding tubers will sometimes crack the pots, but it cannot be deemed a serious risk.