I usually get the saffron put to bed for the summer in April, but I’ll take late May given all the stuff I’m juggling. About six kinds of grass needed to be weeded, as that is one of the worst enemies of a sleeping saffron corm. Being buried about 9″ down, weeding the first two inches doesn't bother the corms at all. The greens/leaves should have been dry and dead enough that taking them with the weeds shouldn’t harm the fall harvest.
The Zoo Doo in a garbage can in my driveway caught some rain and made a big batch of compost tea, and I poured a couple dozen liters of that onto the weeded dirt as a last snack before bedtime. Then I put an actual layer of compost on top. Saffron corms are heavy feeders and not amending the bed annually seems to be the biggest factor in crop reduction.
With the compost topper, a lot of the seeds in the layer I just disturbed will be too smothered to germinate and those that do will stand out for easy weeding. I also like to think the dark surface helps the bed get some extra heat in the cooler PNW summers.