The new www.notcutts.co.uk offers an array products from furniture and tools, to seeds and plants.
Varieties unique to Notcutts.co.uk include the new Coprosma repens Pacific Sunset and Diervilla sessilifolia Col Splash.
The gardening chain hopes to reach a new audience previously unable to visit its centres as well as offering more flexibility for its existing customers.
The site includes top tips and a blog.
Notcutts’ Sage Privilege Club, which offers a permanent 10% discount as well as special offers and events to members throughout the year, gained its 100,000th member in April.
Notcutts chief executive Andy King said: "This is a really exciting time for Notcutts. The website will allow us to reach a whole new national consumer base as well as offering additional services to our existing customers.
"There are now three easy ways to shop at Notcutts, which gives customers choice and also offers them a number of helpful gardening features alongside invaluable tips and advice."