Weeping
Mulberry in the US

To start mulberries from seed, you'll want to get them going indoors, usually in late winter or early spring, depending on your USDA zone. For folks in colder zones, like 3 or 4, aim for April or May. If you're in zones 5 to 7, March or April works, but zones 8-10 can get started earlier, even as early as January or February in the warmest spots. Sow them about a quarter-inch deep in good seed-starting mix, then keep them warm and moist. They can take a while to germinate, so don't give up on 'em too soon, you know what I mean.

Once your seedlings are big enough to handle, gently prick them out and pot them on into individual pots. Let them grow on in a sheltered spot, maybe a cold frame or a sunny windowsill, giving them a bit more space. When they're looking strong and all danger of frost has passed for your area, you can start hardening them off. Gradually get them used to the outdoors before planting them out in their final spot. Remember, these can grow into proper trees, so give 'em plenty of room, maybe 15-20 feet (4.5-6 meters) apart if you're putting a few in, or think about a container variety if space is tight.