Succulents/stonecrops exhibiting allelopathy?

[vadub]

I've been interested in green roof technology for a while and have been thinking about introducing a species that would resist the nearby colonization of wind and bird-shit-bourne weed species.

Is anyone familiar with hardy groundcover like sedum or other stonecrops that exhibit allelopathy or in general suppress the growth of other species?

[EthnoGuy85]

Sempervivum grow really thick here and choke weeds out.

And they're very cold hardy here as well.

[vadub]

Thanks for the input. Whats great about various sedum species is they resist damage when walked on (during maintenance). Semp's fit the bill as well but I'm not sure how they would bounce back when intermittantly trampled upon.

[EthnoGuy85]

Mine get stepped on about once a week and seem to do fine. It tends to encourage them to spread or pup more.