Anyone in here interesting in plants (growing, propagating, maintaining, etc). Figure we can get a forum started to exchange tips.

On a side note, some of the side categories seem overly broad. Hobbies for example is going to get pretty bonkers.

Now that it's legal in Canada to grow cannabis, I decided to try my hand at growing a few plants indoors. I started with a simple setup and a couple of seeds in a closet. As I did more research, I slowly started upgrading my equipment and methods. There is so much more to growing good cannabis indoors than I originally thought, and it's become a very interesting hobby for me. There is also a lot of misinformation and pseudoscience out there, which can make it difficult for new growers.

Anyone else into this hobby? What's your setup like? Anyone thinking of getting into it?

A few people have expressed interest in my indoor, semi-automated growing setup so here's the lowdown.. In a corner of my workshop is a cupboard with a footprint of 1.6x1.2m, 2.2m high. This is insulated with a mixture of glasswool, foam board and expanding foam (depending on what I could install where), and lined with diamond pattern aluminumised mylar (the diamond pattern provides diffuse reflection to avoid hotspots).

Inside the cupboard I have 750W of full-spectrum LED lighting, a 500W oil-filled radiator, and a small fan to keep air moving around. There's a vent which pulls air from the outside and a extractor fan which also vents outside. Being able to pull cool air from the outside (even in summer) is extremely useful as the lights can put out quite a lot of heat.

My main growsystem is an Amazon low-pressure aeroponics system, and I've also got some airpots to do some soil-based growing in. Aero on the right, pots on the left. If you're not familiar with aeroponics, it's a system where the plants roots hang in open space and nutrient-rich water is sprayed or misted over them. High-pressure aero uses mist and low pressure uses sprayers. High pressure aero is currently one of the best known ways to maximise plant growth but low-pressure is pretty good too and you don't need anywhere near as much gear like pressure vessels and solenoid and so on. I just have an aquarium pump which drives the sprayers. In my experience aero is considerably more efficient than soil, non-soil media or other hydroponics - but on the other hand it's very twitchy. If your nutrient balance is off or your pH is wrong or worse, you pump fails - things can go wrong very quickly.

The airpots are totally new to me. People say they're good but I have no idea. I have a mixture of compost, perlite and coco coir to go into them so we'll see how that works out. I'm going to use organic nutrients only on them, I have some seaweed derived stuff which should be good throughout the entire grow process.

So that's the hardware, now on to the fun bit - the automation...

On top of the cabinet is a board hosting a Raspberry Pi model A - these days I'd use a Zero W but they didn't exist when I built this. In it's mostly-bare state the board looks like this. Quick explanation - the red board is mains-rated relays which let me switch the connections above it on and off using the Pi. This is where the lights, fan and heater are wired to. The small junction block left of the relays is connected to mains.

The block up and left of the Pi is 5V, which drives the Pi, the relay control electronics and provides power to the junction block on the right. There are various sensors wired in to that block and connected back to the Pi.

Wired up on my bench for testing it looks like this, and in situ it looks like this (this was on a previous iteration of the cupboard but it's basically the same now). The orange cables on the left are lights, fan and heater. The black cables top are the sensors.

Temperature is monitored using five DS18B20 sensors, which are cheap and reasonably accurate serial devices so you can run a whole bunch of them off a single pin on the pi. I monitor my water temperature, the temperature at the plant stem, at the wall, inside my workshop (but outside the cupboard) and outside temperature. The wall/stem temperature is the important one, that determines whether heating or cooling is engaged. I monitor the exterior and interior temperatures to know how effective my insulation is being. If water temperature gets too high I might add an agent which protects against microbial infections that like warmer water.

I do have a DHT22 humidity sensor but they're hella flaky and it's currently not working. I will replace it at some point but past experience suggests humidity is high whatever I do.

The Pi has a python script which runs every five minutes. It reads all the sensors, decides what (if anything) to do, then logs everything in a sqlite database. If it's 'night' (which is actually day outside, for temperature management reasons) it turns the lights off, if it's 'day' it turns them on. If it's cold it turns the heater on, if it's hot the fan. There's a bit of smartness where it actually aims for a midpoint of temperature because otherwise it's always aiming for highest temperature then immediately cooling again, then heating and so on - a stable temperature is better for the plants. At 'night' I tend to run the fan to drop the temperature: plants often like it cooler during darkness, get some fresh air in and attempt to lower the humidity a bit.

There is a web interface which lets me see what's going on - current temperature and status, plus some lovely lovely charts (who doesn't love a nice chart?). I can also turn the lights out from here in case I need to go in an do some maintenance for anything. 750W of LED light is painfully bright, it's much more comfortable (and safer!) to turn them off while topping up reservoirs or changing water or whatever.

It would be relatively trivial to add sensors for moisture or pH to add an auto-watering or auto-adjusting nutrient systems, but I haven't felt the need to do that yet.

Happy to do my best to answer any questions anyone has.

I've enjoyed the challenges of gardening in zone 5 -6 and zone 10 - 11, and am wondering about others' experience.

Climate change, with migrating pests/diseases and more erratic weather, are definitely noticeable trends.

While it's interesting to grow ornamentals and food crops that wouldn't ordinarily be available, it's also disturbing to find falling yields and utter collapses of formerly successful "easy" plants like basil and temperate climate tomato varieties.

There are limits on how much can be accomplished with purely "organic" controls - I've had to experiment with soil ecology (MycoStop for fungal infections, etc.). Allergenic plants are an increasing problem. There are brand new animal pests where I live as well - iguanas, pythons, and other hot-climate reptiles.

I'm curious about others' gardening results, and suggestions for improving adaptability.

Cross-posted with /r/composting

I'm pretty proud of the results of my first year of serious composting (before this year, my method was, "dump kitchen scraps in a pile and turn it occasionally"), so I figured I'd share. Here's a picture of the pile, opened up yesterday for turning/dumping fresh kitchen scraps. Closer view, and even closer. As you can see, it still has a ways to go. It consists of mostly kitchen scraps, grass clippings, and oak leaves, and I guess the latter of those takes quite a while to break down. Here's a picture of it covered with a tarp after I was done, yesterday.

This is actually a combination of eight different smaller piles I worked on throughout the year while I was teaching myself to make compost. The first piles I made were basically just the result of mowing some tall grass/wild plants in the spring--I had thought that since I was mowing up both leaves and grass that the ratio would be just right for composting. I was wrong. Those three piles didn't really go anywhere. I should've added far more leaf matter, kept them wetter, and combined them into one rather than three.

The fourth pile was a combination of kitchen scraps and leaf matter. I had about a 1/2:1 ratio of leaf matter to kitchen scraps. It turned out okay, but of course, I should've added more browns. The fifth pile (featuring a guest who liked the "fresh greens" that I often went outside to spray onto the pile, if you catch my drift...) started out with probably a 1:1 ratio of browns to greens and ended up with a 2:1 ratio, since I started actually figuring things out. I used both mowed-up leaves and mowed-up household paper waste for my browns, and kitchen scraps and grass clippings for my greens. The pile did end up getting fairly warm. I turned it every 2-4 days.

The sixth and seventh piles were nothing but oak leaves mixed with grass clippings. I wasn't great about getting the ratios exactly right, but they were both probably close to 1 1/2:1 browns to greens. Both heated up after I turned them, every few days, and turned out great. I think I do have some pictures, but can't find them.

I started using a tarp with my eighth pile, and that tarp, as well as the increased amount of browns--always at least 2:1--made a huge difference, as previously I had a hard time keeping piles at the right moisture level. Either they'd dry out in the sun or they'd get soaked in the rain. The tarp protected from both and helped insulate the pile, enabling it to get to the right temperature despite being fairly small.

I tried to follow the Berkeley method closely (other than that I added to it every time I turned it). If I added new scraps, I let it sit for four days; otherwise, I turned it every other day. I started adding pretty much anything to it. One time while I was turning it, I found a dessicated dead robin nearby and tossed that in. There was no trace of it the next time I turned the pile.

Fairly recently, I combined all of my piles into one, as you saw above. This makes it a lot harder to turn, but it seems to be going well. Instead of making a new pile and letting this one sit, I've continued adding to this one every week, when I turn it (now that it's this big, it's hard to find time to turn it more often than that). I'm not sure if I'll be able to do this through winter. I've been stocking up on coffee grounds from Starbucks (I have maybe 8 bags of them sitting in the garage?) to help me keep it going, but it gets pretty cold here in Michigan. Maybe I should start a new pile in the winter rather than keeping this one going; I haven't decided, yet. I'm happy to hear your suggestions.

Thanks for reading! Tremendous thanks to /r/composting; everyone there is incredibly helpful, and there are many very knowledgeable folks there. I couldn't have learned this much about composting without them. I've offered them my five invitations, so hopefully we can eventually get the same kind of composting/gardening discussion over here!

I'm hardly an expert after just one year of composting, but I'm happy to answer any questions you have about my methods, about composting in general, or about how you might get started.

Now for some bonus pics, just for fun:

A bear admiring my pile
That same bear about to destroy a bird feeder... D'oh.
Compost/Hugelkultur-in-progress (I'm not sure how people find the time to gather enough woody materials/grass clippings to make a hugelkultur all at once!)

I don't have the land to do it yet, but my dream is to build a year-round greenhouse in a back yard, so that I can have green all throughout the monochromatic bleakness of a New York winter. This is pretty much a daydream at this point, but I'd like to get some feedback from folks in the know.

The feature wish-list is as follows:

• a dug-out trench, shaped like a V with a flat bottom. Thinking something like 12' (or go metric and make it 4m) wide in the middle, with sides at a 60° angle going to ground level (total depth of around 10' or 2.5m)
• a double-paned glass or plexiglass roof, for insulation and lighting
• heating elements in the outer layer of roof, for snow and ice removal
• a space heater, to regulate temperature during the cold months
• an aquaponics tank (probably using goldfish, but possibly tilapia)
• aquaponics grow beds lining the angled sides
• compost-activated biochar beds on the flat part

The idea would be to run the aquaponic outflow to the top of the sloping sides, supporting herbs, leafy greens, and flowers. The runoff collects at the bottom of the slope, where it is returned to the fish tank. The flat surface would be used for root vegetables and bulbs like onions and garlic.

I realize that this is a tad ambitious (and that I may just be throwing the biochar bit because I think its cool), but part of why I'm posting this is to get the benefit of collective experience. Any thoughts?