Photo courtesy of paulansorge at Flickr.com.
Although limestone-derived soils like the kind we have here in Dallas tend to be thick, black, and rich, they’re also highly alkaline. Some garden plants, however, prefer a lower pH than alkaline soils can offer.
One way to provide it is by working certain types of mulch into the soil: pine and cypress bark, oak leaves, peat moss, and pine needles are all high in natural acids, and can help cut down on alkalinity if regularly worked into the soil. Be prepared for a lot of work, however: limestone basically weathers into clay, so you’re likely to be presented with a thick, hard-to-work mass that might require a lot of moisture and a rototiller to do much with.
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