To be sick of my mum nagging me to take up gardening?

[dilemma456]

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Maybe she is dropping hints as to what she wants?

YANBU. Just tell her you want cash.

Honestly, you'd be so much more chilled if you only took up gardening.

Why don't you buy her the Guerilla Gardener's Handbook for Christmas - this is clearly what she wants you to do. You could get arrested for illicit gardening, perhaps.