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How deep of a barrier do I need to contain Maximillian sunflowers?

 
pollinator
Posts: 1559
Location: Denver, CO
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I'm planting a patch of Maximillian sunflowers near a neighbor's fence, and want to put in a root barrier to contain them on my side. (And keep their grass on their side.) How deep do you think I should go?
 
pollinator
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Location: Montana
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In my experience Maximilian sunflowers do not spread but remain in nice distinct clumps.
 
gardener
Posts: 1870
Location: Just northwest of Austin, TX
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In my experience of wild sunflowers they spread by seed and don't survive mowing.  If your neighbor has a grass lawn that they mow, neither of you will need to take any extra steps, to control the sunflowers.

Now controlling the grass is a different matter.  Let me know if you discover an effective barrier for grass roots.  I control mine by persistent pulling, but they can travel several feet underground. It's a garden task force that never really ends.
 
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