Answer: Raspberries are considered brambles and as such are reasonably drought tolerant. Their roots go deep, so plan on supplying enough water to thoroughly wet the roots. One-inch of water per week will keep your raspberry plants happy. Berry size has more to do with cultivar, maturity, and health of the plant than it does on the amount of water a plant receives. So, all things considered, more water will probably not increase the size of berries.
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