I've managed to grow a small sprout from a grapefruit seed. I live in India where it's very hot. Can I continue to grow it in a pot with diameter of about 15 inches?
Be careful not to put the seeding in to large of a pot while it is still small.
When the seedling has several sets of leaves you can move it to a 6 inch pot.
Your plant need 4 to 6 hours of bright sunlight daily and temperatures in the 60 to 70 degree F range.
When the plant is 4 to 5 inches tall you can move it to a bigger pot.