It not blue himalayan diesel, i grew that before and it not look like that. Your sick plants look like they are suffering from lack of water. I had plants both in soil and hydro that looked like that years ago. Gave them a good watering and watched them perk up in front of my eyes within seconds. All looks good though and those that are losing colour in the fan leaves are doing what they should be doing towards the end of flowering. If you want to grow direct into the ground there then it looks like some serious prep is needed for next year. Bit of elbow grease with a half decent shovel/spade, turn soil with several bags of compost, leave over winter with some black bags or tarpaulin covering the patches you want to grow in next year. Covering the area should stop anything growing there and also keep the soil warm. If you can then dig the holes around 2' deep as you say the soil is rather peaty so will probably not be so good but should be ok with some compost. Am hoping to get an update on mine soon and hopefully the flies will have buzzed off as there are too many to deal with up there.