Answer: Nasturtiums grow best in full sun, with afternoon shade where summers are hot. They will grow in poor to average, moist, well-drained, slightly acid soil. In your region, Nasturtiums will perform well on a deck with afternoon sun, because the weather is not intensely hot and dry for prolong periods of time. Typically the only dry month in the Pacific Northwest is August, and flowering may slow a little during this time, but otherwise, Nasturtiums should be happy in the spot you've chosen for them.
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