Growing Plants & Grass Under Trees

I have a lot of Gum trees in my yard and I can not get anything to grow around them. They seem to pull everything in for just them and nothing else will survive. Is there anything I can do to make flowers and grass grow around them? 

Landscaping around trees can be a challenge, but not an impossible one.  Growing grass under trees where there is less than 2 hours of sunlight, I would consider being a futile effort.  Rather select plants that will tolerate dry shade.  

·         Aucuba japonica

·         Berberis thunbergii

·         Caladium x hortulanum

·         Clematis reticulata

·         Cornus florida

·         Dryopteris erythrosora - Shield Fern

·         Euonymus japonica

·         Hedera helix -

·         Hemerocallis spp. - Day lilies

·         Kalmia latifolia - Mountain Laurel

·         Ligustrum spp. - Privet

·         Liriope muscari

·         Liriope spp.

·         Mahonia sp. - Mahonia

·         Nandina domestica - Heavenly Bamboo

·         Ophiopogon japonicus - Mondo Grass

·         Parthenocissus quinquefolia - Virginia Creeper

·         Potentilla spp. Rhododendron spp.