Full sun to half shade, in any soil that has good drainage. Ivy typically doesn't tolerate excessive soil moisture, but 'Gloire de Marengo' is notably less concerned about wet feet. It is also, therefore, less drought-tolerant than is usual for ivy, too. Ivy is very pH-tolerant, thriving in sweet as well as acid soils.
How to handle it: The Basics
Where it is solidly hardy, ivy could scarcely be easier to establish. In cooler climates, plant only in Spring after frost danger; water as needed so the plant establishes over the Summer. In Zone 9 and warmer, you could also plant in the Fall, which lessens the need for watering to get the plant established in its first year.
The real challenge is controlling the ivy's rampant growth in subsequent years in a way that's practical as well as pleasing.
When used as a groundcover, you'll need to control outward spread as well as prevent climbing. Ivy can climb almost anything, from bare rock or glass, to wood fences and buildings, to the trunks and even the narrow branches of living shrubs and trees. Control outward spread by pruning the perimeter of the colony a couple of times a year. Control upward spread by pulling attached stems free and then cutting them; if you just cut them, they'll continue to adhere even after they're dead.
In milder climates, the thickness of the groundcovering growth itself needs control if the look isn't to become that of an ever-more-lumpy mattress. Every few years, brush-hog the entire colony at the beginning of a growth cycle; ivy resprouts easily, both from cut stems and directly from underground.
All of these control measures are practical only if the entire colony, as well as its entire perimeter, are both readily accessible. Ivy is not the evergreen groundcover to use amid groups of low-branched deciduous shrubs, or where the planting borders the native landscape. For those uses consider non-climbing and non-vining groundcovers instead.
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