Mean new root numbers and percentage (in parentheses, rounded to a whole number) of 16 palm species by two depth zones and out to 90 cm from the trunk, The Los Angeles County Arboretum & Botanic Garden, Arcadia, California, 1997–2000.
| Species | Depth | |
|---|---|---|
| 0–30 cm | 30–60 cm | |
| Archontophoenix cunninghamiana | 14.0 a (72) | 5.6 b (29) |
| Brahea edulis | 5.7 a (92) | 0.5 b (9) |
| Butia capitata | 8.5 (53) | 7.6 (47) |
| Caryota mitis | 21.4 a (77) | 6.5 b (23) |
| Chamaerops humilis | 14.4 a (76) | 4.6 b (24) |
| Livistona chinensis | 15.0 (53) | 13.5 (48) |
| Livistona decipiens | 66.6 a (84) | 13.0 b (16) |
| Phoenix canariensis | 78.5 a (80) | 18.9 b (20) |
| Phoenix reclinata | 77.7 a (67) | 38.7 b (33) |
| Rhapidophyllum hystrix | 17.3 a (64) | 9.7 b (36) |
| Sabal etonia | 16.4 a (70) | 7.1 b (30) |
| Serenoa repens | 12.3 a (73) | 4.5 b (27) |
| Syagrus romanzoffiana | 49.8 (50) | 50.5 (50) |
| Trachycarpus fortunei | 45.8 a (77) | 13.5 b (23) |
| Trachycarpus wagnerianus | 91.6 a (97) | 2.5 b (3) |
| Washingtonia robusta | 116.5 a (71) | 46.7 b (29) |
Means in the same row followed by a different letter are significantly different according to paired t-tests between columns, P < 0.05