Coral Trees - Knowledgebase Question

Malibu, CA
Question by hilburn
September 9, 1999
I have coral trees planted within six feet of drain pipes which are at a depth of 4 feet. I am concerned, having seen how invasive roots of mature coral can be, that someday they may do damage to my drain system. Do I have anything to worry about?

Answer from NGA
September 9, 1999


The Kaffirboom Coral Tree (Erythrina caffra) is a large, spreading, semi-evergreen tree native to South Africa. At a mature height of 40'-60', with equal spread, you can expect the roots to extend at least as far out as the canopy. For this reason, I'd be concerned. While you may not have trouble with the drainfield for years, you can reasonably expect the roots to invade the drainfield, which will provide a rich source of nutrients and moisture. If your trees are young, you have an opportunity to relocate them before they do permanent damage to your drainfield.

There are really no recommended trees or shrubs to plant near your drainfield. Turfgrass is the best groundcover and shallow-rooted herbacious annuals and perennials are acceptable plants for near a drainfield.

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