I know you can't eat asparagus ferns...but...it's a bed of edible asparagus. I've been taking sprouts from the bed for almost 2 months now. I'm talking about the ones that went to fern before I cut them...sometimes it was because they started ferning out in a day, but the big ones are because I didn't even realize I had asparagus until I saw the ferns.
There is asparagus, which is edible. My mother grew it for the foliage in her flower beds. There is an asparagus fern which is a potted plant. My wife loves them so we have several. Some or so big that I have to have a two wheel dolly to move them. We also have many voulenteer ones around our car port that came up from seeds. The winter kills them down and up they come in the spring.
Edible asparagus grows fronds if it isn't picked. After enjoying them for 6 to 8 weeks they go to rest and they do form fronds, which are not cut down until they are yellowed by frost - late November to early December. Then the beds are cleaned, compost is applied on top of each asparagus plant and they sleep until April. We do not grow the type that comes from the red seeds.
We have never had them snap off at the base so I don't know the problem.
I grow asparagus and my fronds flop over too. I stake as many as I can but there are still some that flop. I doubt one broken frond will matter much. Mine get very tall ~5-6 ft so they are too heavy to stay up right.
Edible Asparagus will grow a fern-like phase.
If these fall over, snap off then I would stake them, or add tomato cages.
A few bamboo sticks around and through the bed, then some twine that will decompose (cotton twine) zig-zagged between the bamboo will add enough support. When the ferns die naturally, and you compost them, they are so tangled with the twine that you will simply toss twine and all onto the compost bin. That is why I use cotton twine. It will compost just fine.
Asparagus was moved so is allowed to fern out, the mater cages are around the eggplants- the bungee cords will contain loosely the fronds as they grow against the wires. Let them grow, they nourish next years shoots, and are there since the thin shoots were left to grow. Last year got a little untended...#5 is by common name asparagus fern, invasive, roots will break glass pots and has thorns