Mt. Cuba Center Research Report - Phlox for the Mid-Atlantic Region Mt. Cuba Center Phlox for the Mid-Atlantic Region - Page 19

SHADE PHLOX About the Shade Phlox Trial This evaluation took place at Mt. Cuba Center, located near Wilmington, DE (USDA Hardiness Zone 7a/6b). Forty-three taxa representing Phlox divaricata, Phlox stolonifera, and several related hybrids were trialed over a three-year period (2015-2017). Plants were evaluated to assess their habit, vigor, and floral display. Five plants of each taxon were spaced linearly on 2' centers. They were grown under a shade structure that provided uniform shading of 60%. In a garden setting this would be most similar to dappled shade or an area that receives only a couple of hours of direct sunlight each day. The plants were grown in a soil best described as clay-loam with a pH near 6.5. Each species or cultivar was measured weekly during the spring and monthly during the rest of the growing season. Ratings were assigned on a scale of 1-5 (1 being very poor and 5 being excellent). The floral display rating was based on the percentage of the plant covered in flowers while the plant/foliage rating accounted for attributes like habit, vigor, and foliage retention. The plant and floral ratings were then averaged, after which points were deducted for deaths of two or more plants. Throughout the shade-loving Phlox trial, plants were given minimal care. No fungicides were used, and supplemental water was provided only during the first year to encourage establishment. This strategy is designed to test the plants in a manner similar to how most landscapes are maintained. Plant Characteristics & Performance Summary Ratings Phlox Rating Avg. Height Avg. Width Flower Color Bloom Time P. 'PPPHL0604' (Britney) 2.8 ««« 6” 24” pink April–May P. 'PPPHL0617' (Miley) 2.5 ««« 8” 24” pinkish purple April–May P. 'PPPHL07101' (Lindsay) 2.9 ««« 8” 30” pink April–May P. 'Spring Delight' 2.6 ««« 20” 30” pink late May–early June P. 'Violet Pinwheels' 3.1 ««« 4” 18” violet April–May P. divaricata 3.5 «««« 18” 40” lavender April–May P. divaricata 'Blue Dreams' 2.2 «« 12” 18” bluish lavender April–May P. divaricata 'Blue Elf' 2.2 «« 6” 16” light purple April–May P. divaricata 'Blue Moon' 3.5 «««« 16” 32” lavender April–May P. divaricata 'Blue Perfume' 2.2 «« 14” 20” light lavender April–May P. divaricata 'Charleston Pink' 3.2 ««« 12” 28” pink April–May P. divaricata 'Clouds of Perfume' 2.6 ««« 12” 20” lavender May P. divaricata 'Dirigo Ice' 2.8 ««« 10” 18” pale blue April–May P. divaricata 'Fuller’s White' 2.2 «« 10” 14” white April–May P. divaricata 'London Grove Blue' 3.1 ««« 14” 28” bluish lavender April–May P. divaricata 'Louisiana Blue' 2.3 ««« 10” 16” purple April–May P. divaricata 'Manita' 2.0 «« 12” 16” pale bluish lavender April–May P. divaricata 'Mary Helen' 2.6 ««« 12” 20” purple April–May P. divaricata 'May Breeze' 3.0 ««« 16” 24” white April–May P. divaricata 'Plum Perfect' 1.2 « 6” 16” purple April – May P. divaricata 'Tika' 2.4 ««« 12” 22” dark lavender April–May P. divaricata 'Tinian Sprite' 3.1 ««« 10” 18” pink April–May P. divaricata 'White Perfume' 2.5 ««« 12” 16” white April–May P. divaricata "white" 3.0 ««« 12” 30” white April – May P. divaricata ssp. laphamii 2.8 ««« 20” 36” lavender April–May P. divaricata ssp. laphamii 'Chattahoochee' 2.8 ««« 6” 20” lavender w/ purple eye April–May P. stolonifera 2.8 ««« 10” increased 1-2' per year pink April–May P. stolonifera 'Bruce’s White' 2.9 ««« 8” increased 1-2' per year white April P. stolonifera 'Fran’s Purple' 4.2 «««« 8” increased 1-2' per year purple April P. stolonifera 'Home Fires' 3.4 «««« 12” increased 1-2' per year pink April P. 7FfW&t'&FW66V2r" ***( 7&V6VB"rW"V"W'R&( 47FfW&t&vRr2" ***( 7&V6VB"rW"V"fVFW"&7FfW&t'&VRg&Wr2 ***( 7&V6VB"rW"V"&7FfW&u&FvRr2R ****( 7&V6VB"rW"V"&7FfW&u6W'vBW'RrB ****.( 7&V6VB"rW"V"W'R&7FfW&uf&VvFr *N( 7&V6VB"rW"V"& 9r&7V&V2u&gW6r22 ****( #N( &f6BF7V&6VFW"&r&W6V&6G&v&FVf"&RFWFVBf&F&WBV6BFRfvr7VFf'2FVB&Vf&R6WFrF&VRV'2bFRG&âtvVƖrtw&VV7&rrus#r&2us3rvv7FfW&t&VR&FvRrB7FfW&uvVW6R6֗Fr&FrWSW6VVBCvB3f"#"fW' G2&B&RFRFW&f&֖r6VV7F2F7V&6VFW"&p