Dahlia

Lab tests found 8-33 µmol of pigment per gram in ‘black’ dahlias vs 1-2 in red ones. See why black dahlias fade and which 8 near-black varieties to plant.

Your dahlia’s yellowing leaves could be three different problems. This diagnostic table shows which one you actually have — and which to leave alone.

Wrong pot size is why most container dahlias rot. See the exact size by dahlia type, a soil mix that drains, and the 4 mistakes to avoid before you plant.