Growing Zucchini, also Courgette/Marrow, Summer squash

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13 Jan 18 John Bass (New Zealand - temperate climate)
re the question of 17 December. Tips of new courgettes turn yellow and then die back. Cause and treatment please.
17 Sep 18 Mike (Australia - sub-tropical climate)
Probably not being pollinated by bees. Female flower is only open for a day or so and generally shut by lunch. Read up about hand pollinating.
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