mystery plant

mystery plant

Observation - mystery plant - Global. Description: There are spikes all along the stem on the underside of the leaves and along the veins on the underside of the leaves. The spikes on the top side of the leaves seem random and where they protrude look a bit 'warty'. The entire rosette is at least half a m

There are spikes all along the stem on the underside of the leaves and along the veins on the underside of the leaves. The spikes on the top side of the leaves seem random and where they protrude look a bit 'warty'. The entire rosette is at least half a metre in diametre. Despite best efforts I have not managed to identify this plant - can anybody help?