Here's some new leaves on my S. purpurea taken about two weeks ago. The largest leaf pictured here opened fully about 4-5 days ago and is starting to redden up - beginning with red veining on the inside of the hood. The red leaves behind it are left over old leaves. I trimmed off three or four old leaves. The biggest new leaf is at least 1/3rd larger the the largest old leaf (removed). Strange how the leaves start out red, then lighten to green then darken to red again.