The four-year-old company supplies 150 garden centres and offers an online shop for their customers to order from directly. It has a new bulb range for August delivery.
ESD director Paul Moors said: "We continue to source outdoor plants direct from growers across the eurozone, but when it comes to indoor plants there was one company selling quality plants into the UK already. We had our sights set on them.
"We have taken on the Dutch companies by doing what we do, but we do it in a British way and with British service levels and values."
Moors added: "The start to this calendar year, despite the cold snap and strong trading figures from last year, has still given us a year-on-year sales increase."
ESD director Matt Graham said: "Trade has been okay for us because we are continuing to build our customer base, but garden centres are having another tough ride. Many stocked up well for Easter but trade was very slow over this period, so they have been struggling to clear since.
"Even now, several we have spoken to are still on buying bans - for the middle of April, that's pretty scary."
Graham added that herbaceous plant sales have been growing slowly, in line with trade, but he has noted "a lot of discounting".
"Homebase and B&Q have half-price plants, which is unusually early. Ordinarily you can sell things through this time of year, but if you have stock for three or four weeks it's good to sell off."