Question

what costs its gloom on everything ? from the poem of laburnum ​

Answer 1

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But the cawing crows make a lot of noise and make their presence felt while the laburnum tree does not advertise itself. The thundery grey sky $\tt\pink{casts \:its\: gloom\: on\: everything}$ but the little tree is unaffected by it. It continues to be lit up with topaz light.❤