In a decolonized garden, only local varieties will be planted.
We can arrive at this answer because:
The term "colonization" is used to describe a situation where a foreign culture dominates a region that does not belong to it.
In this case, colonized gardens are gardens where all native plantations have been removed to make room for foreign species that are from another region.
Decolonized gardens, on the other hand, are those in which foreign plants have been removed and the area has regained its native vegetation.
In this case, we can say that decolonized gardens have only local varieties, without the introduction of new species.
