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<p>[QUOTE=&quot;Ownedbybear, post: 4279926, member: 29&quot;]There&#039;s garden centres and garden centres. <img src="styles/default/xenforo/smilies/wink.png" class="mceSmilie" alt=";)" unselectable="on" /> </p><p><br /></p><p>I do buy some common plants, but I love specialist places. </p><p><br /></p><p>As to hydrangeas, the blue is down to acid soil, not alkali. You can buy bluing solution, which is basically copper sulphate, or bury old coppers in the soil. </p><p><br /></p><p>Oaks like a slightly acid soil. PLant waste decomposition doesn&#039;t have over much effect on pH levels, but if anything, it would slightly acidify. Very marginal though. </p><p><br /></p><p>Alkali soil is generally the result of underlying chalk deposits or similar inorganic calcium based minerals. There&#039;s a myth that clay soils like my London clay are alkali, but they&#039;re not, they&#039;re acidic, which is why I have rampaging azaleas. First thing I say&nbsp; to anyone with a new garden is test the pH. </p><p><br /></p><p>I could bore you to bits with the chemical reactions now. <img src="styles/default/xenforo/smilies/wink.png" class="mceSmilie" alt=";)" unselectable="on" />[/QUOTE]</p><p><br /></p>

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