Passed with flying colors. Ranked #1 overall. Changed to a beautiful red in winter.

• Sun Hardiness: 5/5

• Drought Hardiness: 5/5

• Rooftop/Zero-Maintenance Performance: 5/5

Fail. Died on roof due to lack of water after sustained lack of rain. Also doesn't block the weeds that well. 

• Sun Hardiness: 3/5

• Drought Hardiness: 2/5

• Rooftop Performance: 1/5 (Died)

Pass (Ranking #5). Although the plant loses its beautiful green color under stress, it still flowers on the roof in zero-maintenance conditions. 

• Sun Hardiness: 4/5

• Drought Hardiness: 4/5

• Rooftop Performance: 3.5/5

Fail. A surprise candidate, as this is not a succulent. This was placed in the shadehouse, but still thrived under low water and nearly zero maintenance. When placed on the roof, it lasted far longer than expected, but ultimately died. 

• Sun Hardiness: 2/5

• Drought Hardiness: 2/5

• Rooftop Performance: Fail (Died) 

Pass (Rank #2). Needs to be hardened somewhat before placed on the roof, but after hardening performs really well. Forming a dense mat that sustains with zero maintenance on the roof. 

• Sun Hardiness: 4/5

• Drought Hardiness: 4/5

• Rooftop Performance: 4/5

Pass (Rank #3). Does exceptionally well on the roof after the plant has matured somewhat. Other forms of lampranthus don't seem to do as well as the purple stem variant. Only downside is the density, allowing weeds to break through (but that can change over time as it grows, or it can be compensated with supplemental Album/G. Japonicum)

• Sun Hardiness: 4/5

• Drought Hardiness: 4/5

• Rooftop Performance: 4/5

Pass (Rank #6). Shrinks in size and turns more yellow when under stress, but it really hangs in there. Would look great with supplemental sedum.

• Sun Hardiness: 3.5/5

• Drought Hardiness: 3/5

• Rooftop Performance: 3/5

Fail because the "Nana" variant of this is is a patented plant. If it wasn't patented, it would be a "Pass." This gives me sufficient evidence that I should benchmark the non-patented Ruschia Lineolata and see how it performs. 

Fail. Seems to be dying off after 3 months on the roof. Looks like it needs more water. 

Pass (Ranked #4). Totally hanging in there with zero-maintenance on the roof.