I did a complete thieving tour of the city of Solitude, looting every container and picking a few pockets, and all I found was ONE green furniture plan.

I guess we'll have to find some crypt with a lot of urns...

Yep, been playing since release and I haven’t got one single furnishing plan, not even a green. The amount of loot-able containers are extremely small and the drop rate must be minuscule. I am indeed starting to think that this is an oversight on their part.

This is the same expansion where a vast majority of the buildings don't even have interiors to explore. Chapter feels slightly incomplete to be honest.

Found one blue ugly curtain in harrowstorm, and 2 plans for green bench Solitude style. I think that drop rate was purposefully tweaked, so people bye furniture from Crown store, and bought furnished houses, instead of unfurnished. The amount of buildings you can enter, gets less and less with every expansion ( compare base game Wayrest and Rimmen or Solitude). Greymoor also introduced more unlootable containers- there are many cupboards and desks, that were not lootable in Greymoor keep, even they looked like other lootable cupboards, desks and trunks.

I've been thieving, questing, exploring, destroying harrowstorms, killing world bosses and generally opening every box, treasure chest, bag and urn I come across every time I'm in the new zones.

I have found exactly one furnishing plan. A blue plan for vampiric drapes if I remember correctly. It was in an urn in the public dungeon down in Blackreach.

That's it, just the one plan. You'd think that I'd at least have found a few green ones as well by now, but no.

The drop rate does indeed seem to be almost non-existent, I’ve gone through the entire zone and I only found the plans for one solitude table ☹️

I gave up and just wait until the patch that lets you buy them for writ vouchers.

The harrowstorms have a small chance of dropping a document pouch, which has a small chance of containing a new furniture plan.

The dwarven public dungeon has a massive amount of containers, but it's very dark, so they're difficult to spot. Also, a chance of a new recipe dropping from them seems quite low.

I've made three trips into that public dungeon opening every container I could find and only ever got one plan. As for harrowstorms, that's a big fat zero. I did find a few more in random containers as I was questing, but in total I probably have no more than four or five since Greymoore went live.

The plans are incredibly rare and frustrating to collect. It's yet another step back from Elsweyr which dropped document pouches often off dragons and included any quality any recipe.

I've done multiple runs through Solitude and hardly ever get any, annoying it's usually a non-Greymoor recipe if I do finally net something.

Blue & Purple drops each have individual cooldown timers - each estimated at ~15 minutes per character per quality (common belief among furniture plan farmers). So the trick is to take 2-5 characters into Nchuthnkarst and switch between them every time you find a blue or purple. This doesn't seem to apply to provisioning recipes, just furnishing plans (and maybe motifs). You'll get a lot of Dwemer motifs this way - IDK if they trigger the purple drop timer, as well.

This is the best place I've heard of and done so far. Hours in there, no purple Vampiric drops for me yet, but got a Solitude one and basegame ones, and a decent amount of blue ones. IDK what everyone means about it being too dark - maybe I just have my graphics settings the right way?

And even though it's a public dungeon, the first like 2 rooms (30-50 containers total?) involve very few enemies. People can help you with a build if you struggle to kill ~3-5 enemies at a time. All bosses skipping.

"If it's so good, why not keep it a secret?" Well, it's only okay, but I do want furnishing plan prices to go down :~p

I'd rank it similar to the Shimmerene Monastery. Haven't heard of a "gold mine" location yet.

The public dungeon in black reach farm from entrance to first door switch characters rinse and repeat

So the trick is to take 2-5 characters into Nchuthnkarst and switch between them every time you find a blue or purple.

I'm doing this for week now with 6 characters, 2-3 times a day and it's really weird. First couple days were really good - almost every time every character get at least one green, blue or purple Greymoor recipe. My main learned 30-40 recipes and I sold some doubles for a lot of money. Two days ago I get only two weak vampiric recipes, yesterday nothing and today morning nothing - now only base game recipes drops for me

It must be some king of algorithm because it's impossible to get so much for couple days and then nothing. Do you have any experience with this? Do I have to wait couple days to reset or this is some pernament limit per character?

Harrowstorms, stealing, public dungeons, delves, every chest, box, barrel, bag, basket since release and I've gotten 1 blue vamp recipe and a plethora of low level can buy at vendor green recipes. I've never seen anything like it.