The late sprays that we sell are all commercial varieties used to produce cut flower. There had been no experience of growing these plants in gardens until we started selling them to the public. The growing instructions that we have given previously have proved to be a little cautious with regard to the protection needed. From the reports we have received from our customers, and from our own trials, it is fair to say that most people can grow them outside without difficulty. The exception will be if you are in a very cold spot and suffer from sharp frosts in November, when the plants are in flower. If this is the case, you will need to follow our original growing advice, which is printed below. However, you will still get better quality flowers if the plants are grown in pots and moved inside before flowering.
The key points to ensure successful growth are a sunny position and well drained soil. One of the problems with these varieties is that, because they are late flowering, they can get very tall when they are planted early in the year. To overcome this, either delay planting until early July, or give your plants a hard stop in early August, reducing them to 30cms (12") in height. This will ensure short, sturdy plants that will produce good length flower stems.