Native to the Hallasan National Park in South Korea, Hydrangea serrata ’Hallasan’ is described by Corinne Mallet as a "dwarf bush, not growing taller than 80 cm, but extending horizontally in a curious way as it produces runners or stoloniferous branches. . ." The foliage is dark green but very rich in anthocyans which adds crimson marks to the foliage. It is indeed very dwarf. Recently listed as cold hardy to Zone 4. If cautious, assume Zones 5 - 8. In recently potting up some 2 gallon stock plants that were potbound we saw the evidence of the ability of this variety to creep - coming out of the roots deep in the 2 gallon were white shoots trying to find their way to spread but being held back by the plastic container.
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