Most likely the poem in Enid Blyton's 'Big Bedtime Book' quoted here:
https://www.enidblytonsociety.co.uk/forums/viewtopic.php?t=6611&start=15
When I stay with Granny
She gives me jobs to do;
I weed her little garden,
And feed her pigeons too.
I take the puppy walking,
I sometimes pick the peas;
I help to gather apples
Fallen from the trees.
But watering the garden
Is what I like the best.
PLEASE let me do that, Granny,
And you can do the rest!