Quick answer: 80 native Pennsylvania plants have a recorded bloom range that includes April.
80 species
- American basswood Tilia americana · 32 states
- American beech Fagus grandifolia · 24 states
- American holly Ilex opaca · 24 states
- American hornbeam Carpinus caroliniana · 29 states
- American mountain ash Sorbus americana · 18 states
- American plum Prunus americana · 25 states
- Atlantic white cedar Chamaecyparis thyoides · 12 states
- Bitternut hickory Carya cordiformis · 12 states
- Black ash Fraxinus nigra · 10 states
- Black cherry Prunus serotina · 32 states
- Black locust Robinia pseudoacacia · 12 states
- Black maple Acer nigrum · 3 states
- Black tupelo Nyssa sylvatica · 19 states
- Black walnut Juglans nigra · 33 states
- Bur oak Quercus macrocarpa · 24 states
- Canada anemone Anemone canadensis · 22 states
- Canada wild rye Elymus canadensis · 18 states
- Canadian serviceberry Amelanchier canadensis · 17 states
- Carolina springbeauty Claytonia caroliniana · 8 states
- Chinkapin oak Quercus muehlenbergii · 14 states
- Chokecherry Prunus virginiana · 35 states
- Common persimmon Diospyros virginiana · 17 states
- Common yarrow Achillea millefolium · 31 states
- Creeping phlox Phlox subulata · 11 states
- Creeping phlox Phlox stolonifera · 2 states
- Downy serviceberry Amelanchier arborea · 34 states
- Dwarf fothergilla Fothergilla gardenii · 9 states
- Dwarf larkspur Delphinium tricorne · 2 states
- Eastern hemlock Tsuga canadensis · 22 states
- Eastern hop-hornbeam Ostrya virginiana · 18 states
- Eastern red cedar Juniperus virginiana · 36 states
- Eastern red columbine Aquilegia canadensis · 36 states
- Eastern redbud Cercis canadensis · 30 states
- Eastern white pine Pinus strobus · 19 states
- Fire pink Silene virginica · 8 states
- Flowering dogwood Cornus florida · 22 states
- Gray birch Betula populifolia · 9 states
- Jacob's ladder Polemonium reptans · 17 states
- Lanceleaf coreopsis Coreopsis lanceolata · 28 states
- Mayapple Podophyllum peltatum · 18 states
- Mockernut hickory Carya tomentosa · 13 states
- Nannyberry Viburnum lentago · 23 states
- New Jersey tea Ceanothus americanus · 31 states
- Northern red oak Quercus rubra · 24 states
- Northern white cedar Thuja occidentalis · 16 states
- Ohio buckeye Aesculus glabra · 12 states
- Pagoda dogwood Cornus alternifolia · 25 states
- Paper birch Betula papyrifera · 16 states
- Pawpaw Asimina triloba · 17 states
- Pignut hickory Carya glabra · 21 states
- Pin cherry Prunus pensylvanica · 3 states
- Pin oak Quercus palustris · 18 states
- Pitch pine Pinus rigida · 12 states
- Porcupine grass Hesperostipa spartea · 2 states
- Post oak Quercus stellata · 9 states
- Prairie Junegrass Koeleria macrantha · 15 states
- Quaking aspen Populus tremuloides · 24 states
- Red baneberry Actaea rubra · 22 states
- Red maple Acer rubrum · 30 states
- Red pine Pinus resinosa · 13 states
- Red spruce Picea rubens · 14 states
- Sassafras Sassafras albidum · 22 states
- Scarlet oak Quercus coccinea · 17 states
- Shagbark hickory Carya ovata · 22 states
- Sourwood Oxydendrum arboreum · 14 states
- Sugar maple Acer saccharum · 28 states
- Sundial lupine Lupinus perennis · 25 states
- Sweet birch Betula lenta · 18 states
- Sweet crabapple Malus coronaria · 5 states
- Sweetbay magnolia Magnolia virginiana · 12 states
- Sweetgum Liquidambar styraciflua · 22 states
- Tamarack Larix laricina · 10 states
- Tulip tree Liriodendron tulipifera · 17 states
- Umbrella tree magnolia Magnolia tripetala · 6 states
- Virginia pine Pinus virginiana · 13 states
- Virginia springbeauty Claytonia virginica · 10 states
- White ash Fraxinus americana · 31 states
- White baneberry Actaea pachypoda · 16 states
- White oak Quercus alba · 33 states
- Wild blue Phlox divaricata · 32 states