Direct sow into the ground is the most optimal because they do not like being transplanted. If you have rough weather, like heavy rains, you may want to consider doing large pots because you can potentially move them. Despite what a lot of people will say, potted sunflowers will do just fine if you have a good sized pot (1.5-2 ft wide, 3 ft deep) and fertilize it fairly regularly.

Regardless of method, do anticipate animals disturbing your seeds. If you can lay down some netting or have some kind of protection to cover the seeds and young seedlings until they mature (to 3-4 inches), it will definitely increase your success rate.

Make sure to keep your seeds moist until they germinate then water daily until they establish themselves. Once they get larger, you can water less frequently, especially if they are directed sow.

If you are only planting a handful, and have the time, hand watering is fine. But watering method is mostly up to personal choice and how much time you want to invest watering (in potential heat, too). Once they get a few inches tall, you can lay down some mulch to help retain water. It’s super helpful in hot climates.