Confine the use of insecticides to the evening and do not spray plants that are in flower.

只限晚间使用杀虫剂，并且不要对花期植物喷药。

《柯林斯英汉双解大词典》

If you have pollen allergies, you should either avoid flowering plants or snip off the flower buds as soon as they appear.

如果您对花粉过敏，您应该避免开花植物，或者在它们出现后，立即剪掉它们。

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Certain plant species won't flower if they sense too much light and some plants will only flower if they sense a specific amount of light.

某些植物种类如果感觉到了太多光就不开花，而有些只有感觉到了一定程度的光才会开花。

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That is the time of year when lilac plants burst into flower throughout much of the United States.

VOA: special.2009.12.31

His company Cofactor Bio offers a sequencing service to complement its GeneLaser DNA Sequencing Kit, which includes reagents for amplifying target sequences, and DNA Barcoding Kit, for identifying the biological origin of samples (available in editions for fish, fungi, flower plants, and other organisms).

FORBES: DNA Sequencing For Fun And Profit: A Low-Cost Platform For Garage Biotech

And a couple of plants that didn't flower.

BBC: RHS Chelsea Flower Show: Suffolk's bee friendly garden

His second was to go into his greenhouse, where the rosemary plants were in misty, lovely flower, and pull from somewhere the cruel adage that rosemary meant remembrance.

ECONOMIST: Tom DeBaggio