Quick answer: 86 native Maryland plants have a recorded bloom range that includes April.
86 species
- Allegheny chinquapin Castanea pumila · 9 states
- American basswood Tilia americana · 32 states
- American beech Fagus grandifolia · 24 states
- American bladdernut Staphylea trifolia · 15 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
- American sycamore Platanus occidentalis · 24 states
- Atlantic white cedar Chamaecyparis thyoides · 12 states
- Bald cypress Taxodium distichum · 16 states
- Bitternut hickory Carya cordiformis · 12 states
- Black cherry Prunus serotina · 32 states
- Black locust Robinia pseudoacacia · 12 states
- Black tupelo Nyssa sylvatica · 19 states
- Black walnut Juglans nigra · 33 states
- Blackhaw Viburnum prunifolium · 12 states
- Blackjack oak Quercus marilandica · 3 states
- Boxelder Acer negundo · 14 states
- Bristly locust Robinia hispida · 9 states
- Canadian serviceberry Amelanchier canadensis · 17 states
- Catawba rosebay Rhododendron catawbiense · 7 states
- Chinkapin oak Quercus muehlenbergii · 14 states
- Chokecherry Prunus virginiana · 35 states
- Common hoptree Ptelea trifoliata · 12 states
- Common persimmon Diospyros virginiana · 17 states
- Common yarrow Achillea millefolium · 31 states
- Coral honeysuckle Lonicera sempervirens · 16 states
- Coralberry Symphoricarpos orbiculatus · 20 states
- Downy serviceberry Amelanchier arborea · 34 states
- Eastern hemlock Tsuga canadensis · 22 states
- Eastern purple coneflower Echinacea purpurea · 22 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
- Flowering dogwood Cornus florida · 22 states
- Fragrant sumac Rhus aromatica · 14 states
- Green ash Fraxinus pennsylvanica · 23 states
- Jacob's ladder Polemonium reptans · 17 states
- Lanceleaf coreopsis Coreopsis lanceolata · 28 states
- Maypop passionflower Passiflora incarnata · 13 states
- Mockernut hickory Carya tomentosa · 13 states
- Mountain maple Acer spicatum · 2 states
- Nannyberry Viburnum lentago · 23 states
- Narrowleaf evening-primrose Oenothera fruticosa · 10 states
- New Jersey tea Ceanothus americanus · 31 states
- Northern catalpa Catalpa speciosa · 9 states
- Northern red oak Quercus rubra · 24 states
- Northern spicebush Lindera benzoin · 16 states
- Northern white cedar Thuja occidentalis · 16 states
- Pagoda dogwood Cornus alternifolia · 25 states
- Pawpaw Asimina triloba · 17 states
- Pignut hickory Carya glabra · 21 states
- Pin oak Quercus palustris · 18 states
- Pitch pine Pinus rigida · 12 states
- Plains coreopsis Coreopsis tinctoria · 16 states
- Post oak Quercus stellata · 9 states
- Red maple Acer rubrum · 30 states
- Red spruce Picea rubens · 14 states
- Rusty blackhaw viburnum Viburnum rufidulum · 12 states
- Sassafras Sassafras albidum · 22 states
- Scarlet oak Quercus coccinea · 17 states
- Shagbark hickory Carya ovata · 22 states
- Shingle oak Quercus imbricaria · 3 states
- Sourwood Oxydendrum arboreum · 14 states
- Southern live oak Quercus virginiana · 13 states
- Southern magnolia Magnolia grandiflora · 10 states
- Southern red oak Quercus falcata · 6 states
- Spotted beebalm Monarda punctata · 14 states
- Striped maple Acer pensylvanicum · 11 states
- Sugar maple Acer saccharum · 28 states
- Sundial lupine Lupinus perennis · 25 states
- Sweet birch Betula lenta · 18 states
- Sweetbay magnolia Magnolia virginiana · 12 states
- Sweetgum Liquidambar styraciflua · 22 states
- Table mountain pine Pinus pungens · 7 states
- Tulip tree Liriodendron tulipifera · 17 states
- Umbrella tree magnolia Magnolia tripetala · 6 states
- Virginia bluebells Mertensia virginica · 14 states
- Virginia pine Pinus virginiana · 13 states
- White ash Fraxinus americana · 31 states
- White fringetree Chionanthus virginicus · 14 states
- White oak Quercus alba · 33 states
- Wild blue Phlox divaricata · 32 states
- Willow oak Quercus phellos · 16 states