First, what are supply lines? Essentially, supply lines let you create a shared inventory between your settlements. Food and water won�t necessarily be shared, but if you have copper in one settlement and need it in another, having a supply line will make it so you don�t have to go and get it �... For Fallout 4 on the PlayStation 4, a GameFAQs message board topic titled "Best food to farm at settlements?".
Fallout 4: Settlement Defense Protecting your Settlers and making them feel safe is very important. Feel free to get happy with the turrets while focusing a lot less on barricades that require assigned settlers.
After the first settlement, you'll be given a quest to help another settlement. This settlement already has a food production so you're free to harvest the plants, complete the quest and then when you're about to turn it in, also plant the crops. That's how I did it.