Sandringham used to buy in tender plug plants and rooted cuttings of dahlias each spring to grow on under heated glass before planting out, but managers have decided to cut back production to cut costs.
Head gardener Martin Woods said: "We’re growing a bit but not as much as we have done in the past. We have a large area of glass and have scaled down. Heating costs are quite a factor and the glasshouses are 30 years old so there is a stage where there are a lot of maintenance costs with them.
"With heating costs being so much we can’t carry on with it so we are reviewing how to grow without so much heat. We’ve decided it’s not cost effective for us. In the future we will just have houseplants. It’s an open ended thing at the moment seeing what we can manage with and how much we can produce ourselves."
Woods has been head gardener for 30 years and has a staff of seven. He has recently taken responsibility for maintaining the glasshouses.