The most effective approach to control is exclusion of light. However, if you can involve everyone in the process, the chances for success are increased. In other words, theres usually a monster on the other side of the fence, waiting for you to lower your guard. Unfortunately, while you mght be controlling its growth, your next door neighbour may not. Keeping the morning glory restricted to the sub-optimal areas by regularly and continually cutting off photosynthetic tissues in more optimal areas will eventually weaken it. For example, it often emerges from the ground in heavy shade, under shrubs, or through stony, dry soil, but eventually makes its way into sun. However, because it usually has a huge root and rhizome network with plenty of reserves, it can tolerate horrible conditions for a long time before it starts to suffer. Calystegia is ultimately not very tolerant of heavy shade, infertile soil nor extended drought and so, tends to favour moist, rich ground in sun or semi-shade. This is why cutting the top off of a morning glory hardly slows it down.Ĭontrol is simple in theory, but seldom achieved. Vegetative growth produces sugars (from photosynthesis), which feed the rhizome network, creating a vast reservoir of energy for continuing growth or regrowth. Worst of all, new plants can be propagated from exceptionally small rhizome pieces, so digging and especially rotovating can make matters much worse.īecause it is an aggressive twiner, morning glory can produce a significant amount of foliage (i.e., vertically, upon shrubs, trees or structures) on a small amount of open ground the roots and rhizomes will be much more laterally extensive. Unfortunately, morning glory also multiplies easily with poor weeding technique well-meaning weeders often inadvertently break the semi-elastic, but ultimately brittle, rhizomes when they pull stems out of the ground. Above-ground stems also have the ability to produce roots and new rhizomes where they touch the ground. Typically, morning glory spreads by rhizomes (horizontal underground stems), which are, like the above-ground parts, extremely vigorous and strong. I would be very surprised if someone had willfully planted Calystegia sepia (morning glory) all over your yard, unless they had something against the previous owners.
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