The 34-centre Tesco owned chain launched Christmas to the media in London in early July.
After comments from some customers, Dobbies said the Livingston display was a "showcase" of items that would be on display fully in September.
Dobbies added: "Our Christmas shop is months in the making behind the scenes. However, our full Christmas range won't be available in ur stores until latr in the year.
Wyevale Garden Centres' trading director Dan Zinner said Christmas would launch "at the same time as usual" this year - September- in Wyevale's 149 centres.