ocr: - - - - - The National Trust now grazes sheep on the grassiand to keep it short and encourage a range ofspecies to grow. Itcarefully manages the number of sheep, how long they graze for, and ati what times. o1 year.so that particular wildflowers survive, such as the cowslip. These flowers provide food sources for the caterpillars of the Downland butterflies. Without grazingfor example the cowslip would not grow. Cowslipleaves.are the only food cowslip sourceforthe caterpillars ofthe Duke of Burgundy Fritillary, - butterfly which iS now under threat.
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