Bottle Brush Buckeye (Aesculus parviflora) Posted on April 11, 2012 by Lucile Whitman Bottle Brush Buckeye (Aesculus parviflora) Bottlebrush Buckeye is a tall growing (10′) wide spreading shrub whose distinctive beauty is in the flower spikes in the summer. zone 4 Size: 1 gallon Price: $25.00 Size: Field grown Price: $115.00