Questions

I planted bamboo at the end of my back garden 6/7 years ago and am now worried that is seems to be spreading to neighbours sites. if i dug a trench and laid paving slabs on their side would it halt spread or how deep do the roots go.

Could you recommend name of suitable apple tree to plant , i would like to plant two ,not too big and easy to grow ie not susceptible to disease . i have reasonable soil plenty of sunlight.