OP is long gone, but waco clay is different, alkaline, than here in the deep wet south.
I asked the google ai (chatgpt) about waco clay:
Waco sits squarely in the Blackland Prairie region of Central Texas, which is famous for its deep, dark "cracking" clay soils—often nicknamed black gumbo.Soil CharacteristicsHigh pH Levels: The native clay soil in this area typically registers a pH between 7.5 and 8.5. A pH of 7.0 is neutral, making Waco's soil highly basic/alkaline.The Limestone Factor: The alkalinity is driven by the area's geological parent material. The soil rests on top of substantial limestone, chalk, and caliche bedrock, which naturally leaches calcium carbonate into the ground.Buffering Capacity: Because clay has a high density and strong nutrient retention capability, it possesses a high "buffering capacity." This means once it is alkaline, it is highly resistant to permanent pH changes.Gardening ImplicationsBecause the soil is alkaline, certain acid-loving plants like blueberries, azaleas, pin oaks, and hydrangeas will struggle with iron deficiencies (chlorosis) and yellowing leaves. If you are looking to balance it out, local turf and landscaping companies like Lawn Doctor of Greater Waco or Texas A&M AgriLife Extension recommend incorporating organic compost, elemental sulfur, or peat moss to temporarily lower the local pH in small garden beds.