10 Large seamless crop plots
In order to grow a crop, you will need three things:

A seed. One of the following plant seeds: Plant Species X Seed.png, Plant Species Y Seed (Scorched Earth).png, Plant Species Z Seed (Aberration).png, Savoroot Seed.png, Longrass Seed.png, Rockarrot Seed.png, or Citronal Seed.png. (Berry seeds also work, but do not benefit from being planted in a Large Crop Plot instead of a Small Crop Plot.)
Irrigation. Usually a water source connected to the plot using a Stone Tap or a Metal Tap. Rainwater or water from a Waterskin also works, but is less reliable.
Fertilization. Fertilizer made in a Compost Bin or by a Dung Beetle or converted in a Toilet lasts the longest, but takes a bit of time to make, so starting with simple Feces might be easier.
Once the plot is irrigated and fertilized, you can place the seed in its inventory and it will be planted after a few seconds.

The plant will mature through several stages over the course of several day cycles, and once it has reached Fruitling status you will be able to harvest it continuously.

Fruitlings will grow and hold up to 300 of their planted berry type or up to 150 if one of the non-berries is planted. Once harvested they will slowly grow back until reaching the maximum yield again.

To change the current plant, access the radial menu by holding 'E', then select 'destroy plant'. This will allow a new seed to be planted.