When it comes to artichokes I do not recommend planting them in a SFG.  These perennial plants grow so huge that it would be better to plant them in an area separate from your SFG boxes.  I have seen artichoke plants do very well in their own 4x4 box using plant spacing of one per 2 square feet. It was amazing to see these “exotic” plant varieties growing so well, even here in Utah with our high altitudes and limited growing season.

Mel B.