Some people--possibly most--considered it useless. The trees didn't grow very tall (we called any woody plant in whose shade you could sit, a tree), and there were all those thorns, and it was hard to get through the brush...so why not root-plow it all away and plant nonnative grass instead? Why preserve any of it? The wildlife that called it home--the songbirds that nested in it, the game birds that used it for cover and ate the seeds that fell, the very rare and beautiful small wild cats (ocelet, jaguarundi), the natives--they knew what it was for, and when it was gone, they began to diminish.
Other parts of the country also have brush--some call it thickets or scrub or chaparral--thick clumps and masses of woody plants mixed with grasses and forbs, and a nuisance to the person who wants everything groomed and tidy. But wherever you have brush, you have wildlife. Of our ~80 acres, about nine and a half, perched on a rocky knoll too thin-soiled to grow useful grass, is brush. A few pockets of deeper soil hav allowed the trees to grow taller, but a lot of those taller trees have died out in the past 15-20 years. The plant species overlap those in the riparian woods a few hundred yards away, but there are distinct differences. Only the brush has kidneywood, paleleaf and twistleaf yucca, Texas persimmon. Only the riparian woods have black willow, American and slippery elm, and eastern persimmon. The difference is largely water, but also soil depth.
Within that ~9.5 acres are patches of bare, hard, flat rock (right now covered with brilliant yellow stonecrop in full bloom) and areas of broken rock or gravel with low bunch-grasses and forbs, and scattered clumps of stunted oak, cedar elm, hackberry forming the nucleus for other woody plants: Texas persimmon, the yuccas, woollybucket bumelia, elbowbush, Mexican buckeye (not a true buckeye), prickly ash, aromatic sumac. Open ground between has the grasses and forbs, providing brilliant color in early spring if there's rain. There are three kinds of cactus: prickly pear, horse crippler, and plains nipple cactus (very small, noticed mostly when it blooms.)
Here, between brushy clumps, are Drummond's wild onion, bluebonnets, greenthread in bloom, with some Texas star blooming in the background--the green bush on the left is elbowbush (a distant relative of ashes and olives) and you all recognize the prickly pear, I'm sure. As the season progresses, and if rain permits, a sequence of wildflowers keeps butterflies, flower-feeding moths and syrphid flies, and even hummingbirds happy.
This is a winter view of an area where we feed winter-resident songbirds. The low tangle of branches is elbowbush...birds can feed in there and be safe from aerial predators (we have several species of falcons and accipiters in the winter) while enjoying the warm sun. I like it because I can watch them right through the bare branches and twigs, while they feel safe and feed normally. For storm shelter, they have the dark green Ashe junipers (left and right). We often have 40-50 birds of half a dozen species feeding in there at once. Most of our winter-resident migrant birds prefer the brushy acreage to anything else on the place.
Here the elbowbush is in full leaf in May--its flowering over, its berries still tiny green nubbins--and its intricately tangled branches and thick cover to the ground provides nesting and feeding cover for the summer-resident songbirds. Is there a bird in there? I don't know unless it sings--no penetrating that solid mass of leaves. Elbowbush also has sweet berries which some of the songbirds relish.
I love brush. I also like grasslands and woods, but I truly love brush.