Quick answer: 32 native Delaware plants have a recorded bloom range that includes March.
32 species
- Allegheny chinquapin Castanea pumila · 9 states
- American holly Ilex opaca · 24 states
- American hornbeam Carpinus caroliniana · 29 states
- American sycamore Platanus occidentalis · 24 states
- Atlantic white cedar Chamaecyparis thyoides · 12 states
- Black cherry Prunus serotina · 32 states
- Boxelder Acer negundo · 14 states
- Common hoptree Ptelea trifoliata · 12 states
- Coral honeysuckle Lonicera sempervirens · 16 states
- Eastern red cedar Juniperus virginiana · 36 states
- Eastern red columbine Aquilegia canadensis · 36 states
- Eastern redbud Cercis canadensis · 30 states
- Flowering dogwood Cornus florida · 22 states
- Loblolly pine Pinus taeda · 14 states
- Maypop passionflower Passiflora incarnata · 13 states
- New Jersey tea Ceanothus americanus · 31 states
- Northern red oak Quercus rubra · 24 states
- Northern spicebush Lindera benzoin · 16 states
- Pin oak Quercus palustris · 18 states
- Pitch pine Pinus rigida · 12 states
- Red maple Acer rubrum · 30 states
- River birch Betula nigra · 23 states
- Sassafras Sassafras albidum · 22 states
- Scarlet oak Quercus coccinea · 17 states
- Shagbark hickory Carya ovata · 22 states
- Southern live oak Quercus virginiana · 13 states
- Southern red oak Quercus falcata · 6 states
- Sweetgum Liquidambar styraciflua · 22 states
- Virginia bluebells Mertensia virginica · 14 states
- White oak Quercus alba · 33 states
- Wild blue Phlox divaricata · 32 states
- Willow oak Quercus phellos · 16 states