Common trees present at the Lyndon B. Johnson National Historical Park include the Plateau Live Oak (Quercus fusiformis Small), Blackjack Oak (Quercus marilandica Muenchh.), Post Oak (Quercus stellata Wang.), Roughleaf Dogwood (Cornus drummondii Mey.), Juniper (Juniperus ashei J. Buchholz), Pecan (Carya illnoinensis), Black Walnut (Juglnas nigra L.), Black Willow (Salix nigra Marsh), Bald Cypress (Taxodium distichum), Hackberry (Celtis laevigata Willd. var. laevigata), and Cedar Elm (Ulmus crassifolia Nutt.).

Historic landscaping efforts have provided the park with other trees such as Mexican Pistachio (Pistacia texana Swingle), Evergreen Sumac (Rhus virens A. Gray), Red Buckeye (Aesculus pavia L.), Chinese Cedar (Juniperus chinensis), Flowering Magnolia (Magnolia grandiflora L.), Chinaberry (Melia azedarach L.), Edible Fig (Ficus carica L.), Creeping Fig (Ficus pumila L.), Sycamore (Platanus occidentalis L.), Mexican Buckeye (Ungnadia speciosa Endl.), and American Elm (Ulmus americana L.).