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How to harvest wild rose petals 
Know when you should harvest the petals. 
Wild rose petals are commonly harvested to make tea, jellies and jams but they can also be used in sandwich spreads, omelets, syrup and salads. The best time to harvest wild rose petals is early in the summer when roses are in full bloom.
However, as mentioned above, some areas will have roses that bloom at different times throughout the year. Run an internet search to find out when roses generally bloom in your area.