Originally Posted by Florida Gardener
Also creates a mess, and will compete with the oak...I still vote for raphis excelsa
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Yeah, the Lady Palm would give you some height in some very low light conditions. For something shorter under those light conditions and without having a low pH soil to deal with would be - Philodendron "Xanudu". Some sources have even suggested Firebush but personally I haven't seen it do well in that low light setting.
The point is, if it's really deep shade, even Azaleas, Camellias & Gardenias still need more light to thrive while liking the lower soil pH typically found under Oaks. The right plant, in the right place will likely thrive and not just survive
. The added stress from the shade will result in pest & disease infestations and generally poor growth. Is there any way the tree canopy can be pruned to open things up and get more light in? Also, a soil pH test is suggested.. Good Luck.