Herniaria Glabra as a ground cover - How deep are its roots?

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We are looking at Herniaria Glabra (rupturewort) as an option for ground cover for our roof garden. Does anyone know how deep its taproot can reach and if it is considered as an aggressive plant in that respect? We need to know this so we determine if a root barrier is required to stop the roots reaching the insulation layer.
 
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It has a pretty shallow root system and will grow just about anywhere...in gravel and driveways, once it gets going. I don't believe it would be aggressive/invasive enough to be a problem on your roof garden.
 
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Rupturewort (Herniaria glabra), in the Pink Family (Caryophyllaceae), is low-growing perennial ground-cover, native to Europe, western & central Asia and northwestern Africa. It can supply the look of a mossy carpet to any full sun to part sun area that receives little or no foot traffic. It would be an ideal choice for a roof garden. I would grow it in combination with other plants of similar culture, such as low Sedum (Crassulaceae) for a more varied and adaptable surface. Though drought-tolerant, such a roof would require some warm-season irrigation in a Mediterranean or semi-arid climate, such as Israel.
 

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