"The Lobelia 'Grape Knee-Hi', is a wonderful new sterile dwarf form with purple flower spikes. Excellent in the shade garden or containers, and a hummingbird favorite. While maintaining a good form has been an age-old problem for many Lobelias, this small-statured Lobelia cardinalis and Lobelia siphilitica backcross has brilliantly solved this dilemma.Grape Knee-Hi is painted in vibrant, deep purple hues and has long lasting freely flowering, tightset spikes.The compact foliage stands on its own all season."