Good to know that things will come back again, if given time perhaps. I've seen that High Alpha Hops like Nugget and Zeus have been fairly disease resistant and also pretty "overwatering" tolerant, too.
But as not everyone has these varieties - or maybe these aren’t assumed as desirable to some home brewers (maybe not as exotic), or you’ve got a supreme hankering for a tasty Brambling Cross hop, but East Kent Golding is about as close as you’re able to get due to the import laws on these rhizomes... you want to make sure you always put your best hop (green) foot forward.
That long phrase-mess said, I am aware that in certain climates/Zones, depending on the level of sand in your soil and tilling it in, that putting down compacted sugary pounds of spent grains attracts from their sugars perhaps unwanted gatherings of ants, ear wigs and likely other pesky things like spores and molds when baked and watered in the air and in the hot summer sun.
My advice is to compost these and hold off using them until prior to the next season. An outdoor composting bin is a great investment for just about any homebrewer & new hop growing aficionado. The level of high temperature container treatment of this compost in degrees Fahrenheit, from baking inside with help from the direct hot sun is a plus to eliminating those concerns.
Another idea that I highly recommend is to make bread (start another hobby) and share it with your friends. Whatever you don’t eat can be composted, too, so there’s even less worry. There’s even a past interesting article about uses for spent grains: http://growlermag.com/spent-but-valuable-ideas-for-using-spent-grain/
Enjoy and happy hoppy growing.