Members can "shop online for thousands of our most popular items and have them delivered straight to your door – with free delivery on your first order" (until November 30).
The website was due to launch in spring 2016 and before that in 2015. Multichannel director Tim Patten left in 2016 after joining in 2014. Wyevale now has two central hubs to deliver from.
Head of multichannel Jim Clear said: "To ensure our new website is truly special for our customers, we have given our Garden Club members an exclusive preview this week to hear their thoughts, ahead of its official launch in early 2017."
Courier standard delivery service costs £4.99 and covers the UK mainland but not Highlands and Islands. Some larger and heavier items are shipped directly from Wyevale Garden Centres ‘trusted partners’ and incur extra charges. For items classed as large and/or heavy there is delivery charge details on the specific product page. Customers will only be charged a single charge for the entire order.
Returns are available, apart from on plants, "because they’re perishable" unless they arrive damaged or in poor condition. Returns can be made at 5,900 Collect+ outlets.
The website includes plants, tools gardening essentials and more, plus Christmas items.
There are "thousands" of products available, including 96 garden tools, for instance.
There are 130 gardening articles and 50 how to videos.
Access to the site is via laptop, mobile and tablet.