Answer: Some plants are more sensitive than others to chemical fumes. It sounds as though your Queen palms fall in this category. If you do not see any new growth, you can unpot one of them and check the roots for signs of life. If the roots are shriveled or brown and dead, the plant is a goner. If you see plump roots that are creamy white inside, the roots are alive but the tops are dead. Cut back the tops and the roots may develop new shoots. If not, the palms should be replaced. Best wishes with your rooftop garden!
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