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How far down in the soil should you place metal edging along beds to keep Bermuda grass from invading?

Just dug out some bed areas and have Bermuda grass growing along side of them, so am wishing to do as much as possible to keep this area free from invasive grasses and weeds. I am going to spread out some pre-emergent as well I am thinking of using this metal edging. And instead of placing it raised along the beds, sinking it down inside of the edges to keep grass from sreading. Will this work and how far down should it be placed? Thanks for your answers!

Public Comments

1. Good luck! Bermuda turf is very invasive. The growth spreads underground by "rhizomes" and on the surface by "stolons" and the root system can be as deep as 2' - 3' in a well irrigated lawn. In a drought stressed scenario, the roots can be as deep as 4'. I'll let you be the judge on how deep to sink the edging. Most of the time you will have to pull it by hand or use an herbicide to control, but even an herbicide has trouble "fully" controlling this invasive grass. This is one reason why Bermuda is used in sports fields and golf courses (deep roots make for a healthy turf as well as aid in drought stress) http://www.blueplanetbiomes.org/bermuda_grass.htm Added info: Pre-emergent herbicides will not control Bermuda grass rhizomes, it will only control the seeds in the soil. ...$Billy Ray$
2. I have 'contractor's grade' black steel lawn bed edging on my beds... it's six inches deep....five inches are in-ground and one is above the soil surface.... the inch above gives me something to weed-whack against, as the Bermuda does try to go over it..... the five inches in the ground has done a good job for me.....