Pokeweed (berries)
Hibiscus (flowers)(dark red or purple ones) make a red-purple dye.
Daylilies (old blooms)
- Safflower - (flowers, soaked in alcohol) - red
Logwood (is a good purple but you have to watch it as it dyes quick when the pot is fresh. Also it exhausts fast. We use alum to mordant and using iron can give you logwood gray.)
Huckleberry gives a good lavender color and I have used it not only for a dye but also for ink.