I shaved off the sharp edges of the Styrofoam pieces which was messy but not too hard. Just pressing in the foam a bit helped a lot with smoothing it all out. I used straight pins with tiny heads to hold the jute in place. Placing the pins close to Styrofoam so that they are covered by the next round of jute worked out well.
The jute got "dyed" with watered down orange paint. I'd say that process was semi-successful. Actual dye might have been brighter, but, I like this dull, mottled look. While I was dying the jute, I also spooned some of the watery paint on the Styrofoam forms, too. Didn't want any white spots showing through!
After stealing a couple of stems from one of my plastic plants for tops we have some lovely carrots to go with the cabbages.