The business, which trades as gardenbargains.com, was bought by TV shopping company Ideal Shopping Direct (ISD) for £5m in January 2010.
McDermott said: "The integration and sales are going well despite the difficult trading season." He asked suppliers with excess stocks to contact him because the firm is "diversifying wildly" and offers "additional routes to market".
New channel Ideal Extra (Freeview channel 41, Sky channel 651) is running five hours of gardening from 1-6pm daily, presented by Steve Bradley, Martyn Cox and Geoff Hodge.
McDermott said grow your own, bigger structural plants and summer bedding were going well. He added that since Woolworth's collapse in late 2008, Gardening Direct had sold more than 30,000 flowering cherries that AE Roberts had grown for the high street chain.
McDermott predicted that after the late start to the season consumer trade would push forward into May.
ISD results for the 53 weeks ending 3 January 2010 showed a rise in sales of 9.2 per cent to £103.3m. Underlying profit before tax was £1.3m. Sales in 2010 are up 17.5 per cent in the first 10 weeks over same period in 2009.
- For further details, email Peter.McDermott@ltgl.co.uk