Never heard of limerite,but it should help,I always add it to my potting-mix :http://www.google.com/products?hl=en&rls=com.microsoft:*&ei=eEwvSumdOp76tgOevvCwCg&resnum=0&q=espoma+garden+lime&um=1&ie=UTF-8&ei=e0wvSte0JJa6tgOoz6nZCA&sa=X&oi=product_result_group&resnum=4&ct=titleYeh 2-3 weeks,just water,so the plant uses up all the leftover nutes.You can use nutes 1 week b4 harvest,if you use this:http://www.discount-hydro.com/productdisp.php?pid=135&navid=17