Gate, yard & garden

A gate that opens by itself - drive home without getting out to open it; it latches itself when closed, no need for a sliding bolt. What is the difference between a spring self-opening gate and an automatic gate? Which should be chosen?

2 large mai (yellow apricot blossom) trees in the yard; 1 pomelo tree - can it be planted on the balcony? When advising on plants in the garden and in the house: state clearly the plant type, plant shape, care notes and the reason for choosing that plant.