The traditional way of breeding them is to remove the disease from some of its tissue, and then allow that to grow into tree, from which seeds can be gathered.
傳統育種專家是利用組織培養將病原去除，讓它「還原」成喬木，結種後再用嫁接方式將病原「種」回去，讓聖誕紅變成觀賞性較佳的灌木型。