Nutrients After Transplating into Larger Container

I am using FFOF.

They say not to add nutrients for the first three to four weeks of growing because of the nutrients in the soil.

I plan on transplanting from a 1 liter pot to a 2 gallon pot. My plants have been in the 1 liter pot for a little over two weeks.

After I transplant should I wait 3 to 4 weeks to feed?

affirmative, not sure on the length of time before fertilizing but fresh soil will provide fresh nutes for the plant. FFOF has plenty of organics. ("tip") decide what time works best for you to cut the lights for 4-6 hours right after transplanting. this allows the plant to recover from root stress. hope this helps

Depends what soil you have possibly.

But regardless I always start with my organic Russian comfrey fert when they first show single fingered leaves - probably only a week old. Works for me.

No feed for a while. You might want to add a bit of Superthrive and B1 product to the water. Helps with transplant shock, if any and supplies some micronutes and hormones to stimulate root growth.
Fred