Description
Hedera helix 'Erecta', a shrubby ivy
To find your way around the great diversity of ivy, we can classify it in different ways.
One of the most classic and scientific is classification by species, based on botanical criteria. But it soon becomes apparent that the species Hedera helix is made up of hundreds, if not thousands, of cultivars, which prompts the search for additional classification criteria.
Another commonly used classification system for ivy is the Pierot system, named after the first president and founder of the American Ivy Society, Mrs. Suzanne Warner Pierot. This system is simply based on the plant's general appearance. It classifies them into 9 categories. It has the advantage of being very simple and suggestive. But it is rather approximate, as the same ivy can be classified in several categories.
Another classification is based on the stage of development reached by the ivy: juvenile, semi-adult, adult. But it's important to bear in mind that the same variety can go through all three stages in succession, of course.
Finally, a fourth system is based on habit. Ivy is either creeping, climbing, bushy or shrubby. But here too, the same variety can be both creeping and climbing, depending on circumstances and environment.
It is therefore usually necessary to use several of these classifications to characterize a particular ivy.
The 'Erecta' ivy would thus be classed with the Hedera helix species , in the "Curiosities" category of the Pierot classification; it's an ivy in the juvenile stage. Finally, in terms of habit, we'd say it's a shrubby ivy, since its stems are erect, rather like a shrub. In fact, they are rather woody, like those of shrubs. It can reach a height of almost 1 metre, without any support or spikes.
Other shrubby ivy
There are other shrubby ivies. The most similar to Hedera helix 'Erecta' is undoubtedly Hedera helix 'Congesta'. They are often confused.
In the same style, we also find Hedera helix 'Conglomerata' which was voted Ivy of the Year by the American Ivy Society in 2015.
We should also mention the "tree" ivy:
- H. rhombea 'Submaginata arborescens
- H. helix 'Irish Lace arborescens
- H. helix 'Pepermint arborescens'
- H. helix 'Deltoidea arborescens'
- H. helix 'Arborescens'
You'll find all the ivy shrubs on this page.
This type of ivy is generally suitable for rock gardens. They remain modest in size, but are upright, so they add volume to a rock garden and create verticals that break up the monotony.
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