Chilies in the greenhouse

First flowers: chilies, 2019 season.

My first hydroponics chili pepper growing season has been bit of a mixed experience so far. On the one hand, the passive hydroponic setup that I installed (based on the AutoPot 4pot system, HydroCoco, and Canna Coco A+B) was a great success. The plats really grew fast.

So fast actually, that I was soon in trouble with them. My planting schedule was based on my earlier experiences with soil-based gardening, but the growth speed in hydroponics is much faster. I germinated the seeds in early February, moved selected seedlings into the AutoPot system in 25th February, and already in early April the plants were so tall they should had been moved to the greenhouse already. My LED plant light system was particularly a bottleneck – the fast-growing chili plants grew quickly up to the maximum height that I could adjust the LED strips into, and I needed to cut them down quite a bit. Even then, the plant growth would have needed better light, and real, strong sunlight that would had been coming from multiple angles, not just from those narrow LED strips.

But we got snow and “takatalvi” (cold spell & wintry weather) in April, and I could not move the plants into the greenhouse. I just kept growing them, cutting them down, growing more – and waiting for the weather to get warmer.

It was only in late May (18th May, to be exact), when the weather forecast told that further snow was now highly unlikely. I started moving the overgrown plants to the greenhouse, but lost maybe half of their branches. The weak, big plants were just not made for punishing physical handling. The hydroponics setup is not designed to be moved around, either.

Poor chilies, moved too late to the greenhouse.

But, I got the plants out, set up the AutoPot system again, this time into the greenhouse, filled it in with water and Canna Coco, and hoped for the best.

All four plants are still alive, which is nice. CAP 270 is in bloom, and is bearing the first fruit even now. But the plants are not that nice looking, as they lost much of their branches in the move, and the growth patterns are not that good, thinking about the future crop. The branches should be stronger, thicker and more symmetrical, to support decent amount of chili pods. Well, we’ll see what the final outcome will be.

The lesson? Maybe I need to carefully think about my cultivation schedules: the plants should be much smaller at the point when they still can safely be moved from indoors to the greenhouse. They should be pruned, so that the powerful growth can be controlled. But otherwise: hydroponic gardening seems like a really interesting option!

The first fruit (C. baccatum, “CAP 270”).

Hydroponics, pt. 3

My chili project was delayed for a week or two (a nasty virus hit), so I have only now gradually been able to set up and move forward with my hydroponics system. I did get the AutoPot 4pot system by mail order (everything else was ok, except the small “tophat grommet” that is used to seal the connection of watertube into the water reservoir tank – I got that from a local store). The growing medium is 60/40 “Gold Label” HydroCoco mix, with a small layer of pure hydrocorn at the bottom.

The LED light system was bit of a challenge to install so that I can adjust the right height of lamps from the tops of chili plants (without fastening anything to the ceiling, as our panels cannot take it). This time it was right spot for an “IkeaHack”: the “elevators” for LED strips were installed into a Ikea MULIG cloth rack. Underneath the entire system a 80 x 80 cm plastic vat was installed, just to be secure with all that water. The outcome is perhaps not very beautiful, but it seems functional enough. Let’s see how the Canna Coco A+B solution that I am feeding them will work out. I am following the mild, rooting phase solution recipe at this point: 20 ml of both fertilizers into a 10 L bucket of water.

My four pots finally host these: Lemon Drop, CAP 270, Sugar Rush Orange, and Hainan Yellow Lantern. (Laura has other four chili seedlings in soil pots.) Looking forward to good growth!

Hydroponics, pt. 2

Short update again on chilies and hydroponics (apologies): my current work on this is focused on three areas. Firstly, I have been trying to figure out what growing method (or sub-method) to use. As I wrote earlier, there are reasons why ‘passive hydroponics’ looks like the best in my case. There are different ways of implementing this, though. Understanding in advance e.g. the risks associated in algae growth, over- (or under-) fertilisation, and pests in passive hydroponics appears to be important. As contrasted with growing in soil, the basic situation with nutrients is very different. In principle the hydroponic growing should be free of many risks coming with soil (less risk of pests and plant diseases, no need for pesticides, etc.) However, a hydroponic farmer needs to be bit of a scientist, in that you need to understand something about physics, chemistry and some (very basic) bioengineering. The choice of growing medium (substrate) is important as in passive hydroponics one should get enough moisture (water) to the plant roots without suffocating them – thus, the material needs to be neutral (no bio-actives or fertilisers by its own), porous and spongy enough to hold suitable amounts of water when irrigated, but also get dry enough so that air can get to the roots in-between drenching.

Secondly, I have been looking into the technical solutions for implementing the hydroponic growing environment. As I wrote, I have considered building my own ‘hempy bucket’ system. However, I kept thinking about root rot, fungus and other risks: in this kind of bucket system, there is always some fertilising liquid just standing in the water reservoir. The standing water provides ideal conditions for algae growth. Stagnate water system can cause lack of oxygen; build-up of salts and decomposing algae can produce toxins. I am not sure how significant those risks are (there are many hempy bucket gardeners who appear perfectly happy with their low-cost systems), but currently I am inclining more towards a commercial passive hydroponics system that also includes some kind of water valve: the idea here is, that the water valve will allow automatic, periodic watering of the growing media (and the root system), but also flush the water away as completely as possible, so that no similar stagnate water reservoir would be in the pots, as in the hempy bucket option. There are at least two models that are widely available and used: AutoPot and PLANT!T GoGro. I am not sure if there is much fundamental different between these two – GoGro appears to be more widely available to where I am living, but some gardeners appear to consider AutoPot (the original, older system) as more robust and a bit more sophisticated.

LED strip (Nelson Garden 23W).

Thirdly, I need to find a plant light solution that works. Currently, the tiny seedlings can nicely fit below the small LED plant light system that I have been long using. However, doing some hydroponic gardening indoors (before the greenhouse season starts) means that I need to be ready to provide enough, and right kinds of light for growing plants. We had an old fluorescent tube lamp, left from Laura’s old aquarium. That lamp was, however, too large and heavy for my needs, and I was also a bit suspicious how safe (in electronic terms) a 10+ year-old lamp setup would be today. Some chili gardeners appear to be using rather expensive, “hi-fi lamps” where different high-intensity discharge lamps (HIDs) have taken over from older incandescents and fluorescent tube lamp systems. Ceramic metal halide lighting and full-spectrum metal halide lighting are used to create powerful light with large amounts of blue and ultraviolet wavelengths that are good for plant growth. The price of good lamps of this kind can be rather high, however. I decided to go for a lightweight but plant-optimised LED system that was a comparably budget-friendly option. I am now setting up four 23W LED strips that were sold as Nelson Garden LED plant light (No.1 and No.2 systems use the same power transformer). Each LED strip is 85 cm long, is specified for 6400 K light temperature, and should provide 2200 lumen, or, more precisely, PPFD (100 mm) 570 µmol/s/m² of lighting power. Having four of those should be enough for four AutoPot style chili growing stations, at least in the early phases of gardening, I think. I am still thinking about how to suspend and adjust these LED strips to correct height above the plants. I am doing this pre-growing phase in my home office corner, in the basement, and e.g. the ceiling panels do not allow attaching anything into them.

Measuring the nutrients.
Measuring the nutrients.

Finally, the choice of growing medium has also an effect on the style of fertilisers to use, and most hydroponic gardeners invest to both EC and pH meters and adjustment solutions, in order to control the salts and acidity levels in the nutrient solution, and to adjust the values in different stages of growth, bloom and fruit production. Some do not take this so seriously, and just try to follow some fertiliser manufacturer’s guidelines and make no measurements at all, just trying to monitor how plants look like. Some study this very scientifically, measuring and adjusting various nutrients, starting from the “key three”: Nitrogen (N), Phosphorus (P) and Potassium (K), which are commonly referred to as the fertilizing products’ NPK value. All these three are needed: nitrogen boosts growth, phosphorous is needed by plant for photosynthesis, cell communication and reproduction; and potassium is crucial for plant’s water regulation. But there are also “micronutrients” (sometimes called “trace elements”) that are needed in smaller amounts, but which still are important for healthy growth – these include, e.g. magnesium. Popular fertilisers for hydroponic gardening often come in multiple components, where e.g. the mixtures for growth, bloom and then the micronutrients are sold and apportioned separately. It is possible to find quite capable all-in-one fertiliser products, however. I am currently planning of using coco coir (neutral side-product of coconut manufacturing) as the growing medium, so I picked “Canna Coco A+B” by Canna Nutrients as my starting hydroponic fertiliser solution. I also bought a simple pH tester for checking the acidity of fertilising solution, and I probably should also invest in a reliable EC meter, at some point. The starting solution for seedlings should be very mild in any case, to avoid over-fertilising.

Testing the pH of our tap water.
Testing the pH of our tap water.

Hydroponics?

I have done my chili gardening so far only with traditional, soil-based methods. The results have been varied, and there seems to be the constant threat of pests, plant diseases, or improper amounts of water and nutrients while working with soil. I am not completely sure how real this observation is, but I think I have noticed that e.g. soil-based chili growing is something that some of the more passionate hobbyists have long left behind. After moving into hydrophonics (where nutrients and oxygen are moved with water flow to plant roots), then to aeroponics (use of moist air to nourish hanging root systems), some even have made use of the NASA experiments in the International Space Station to create “high pressure aeroponics” or ultrasonic “fogponics” systems, where very small, 50 micron droplet size is utilised, to stimulate the growth of fine root hairs (trichoblasts) that maximise the surface area of root system, and produce optimal crop yield with minimal amounts of water and nutrients. The related high-pressure pumps and misting nozzle systems are interesting in engineering sense, I admit.

The first seedlings, spring 2019.

I was personally merely considering the more prosaic “bucket bubbler” hydroponics setup, but even that proved a bit problematic in my case. (There is no electric line running into our greenhouse, where I was planning these hydroponic bubblers to be situated.) Thus, I have now turned towards “passive hydroponics”, which is probably the oldest way this has been applied: growing plants without soil. The version that I am now aiming at is internationally known as a “hempy bucket” method: a black/dark bucket is filled with a 3 parts perlite and 1 part vermiculite mix, where the chili seedling is planted. There needs to be a drill hole for excess water down in the bucket, at c. 2 inches (or c. 5 cm) from the bottom. One then waters the plant with a nutrient, hydroponic solution every other day, until the roots grow and reach the water reservoir at the bottom part of the bucket. The solution watering is then reduced a bit, to twice a week. The water reservoir, bucket microclimate and perlite-vermiculite substrate keeps the upper roots supported, nourished and moist, while also providing nice amounts of oxygen, while the submerged, lower parts of the roots deliver the plant plenty of water and nutrients. The final outcome should be a better and more controlled growing environment than what can be reached in typical soil-based gardening.

For more, see e.g.

Selection of chilies, Spring 2019

Some of the chili crop, 2018.

I have been growing my own crops of chili peppers for few years now, and every year it feels like I am a bit late in starting the germination period. This time, it is already late January, and I am still just selecting the seeds and species to grow. These are the varieties I have narrowed down the selection this time – I have also attached links to Fatalii Seeds, who provide a bit more information about each:

Taken together, all these species and varieties capture quite nicely the enormous range of options that chili cultivation provides. In some, my main interest is in the taste and productivity of chilies, in some, the exotic and interesting looks would provide joy to the hobbyist chili farmer. In some, it the main interest would lie in understanding more about some of the more exotic, alternative options that the chili universe provides. But I think that all of these should be relatively easy to grow, so in that sense they all could be realistic options. Let’s see how this goes; it is clear that I cannot grow as many as I am interested in, and also the number of plants need to be kept to the mininum, considering the small greenhouse and our other spaces.

Chili season 2018, pt. 2

Since mid-January, when I did my chili planting this year, there has been some nice progress. All five varieties that focused on have made it to the stage where they are soon ready to move into bigger, mid-sized pots. Particularly when the small seedlings were moved from the tiny, Ikea cultivation pots into larger ones, and provided some fresh soil for their roots, they really started growing. (I think that I have been using both “Biolan Kylvö- ja Taimimulta” and “Kekkilä Taimimulta” this year.) The hydroponics is no doubt better for larger, production oriented growing of chilies, but for me at least the traditional soil-based growing has proved much easier to handle.

Here are a couple of photos from this stage. The bigger of two Naga Morich plants is already over 15 cm mark, and has been moved into a bigger pot: this one is one from Finnish Orthex, and is called “Eden bioplastic herb pot” (there is a small water storage at the bottom, and the pot also comes with a felt mat, that can be used if this pot is applied to keep store-bought herbs alive).

Naga Morich (C. chinense), mid-April 2018
Naga Morich (C. chinense), mid-April 2018

Most of the other plants are in the c. 10 cm range, below is pictured 7pot Primo Orange:

7pot Primo Orange (C. chinense), mid-April 2018
7pot Primo Orange (C. chinense), mid-April 2018

It will be interesting to see how the plants take the change, first into the windowsill with bright sunlight (they have grown under the Ikea Växer led lights), then into the greenhouse. The spring has been very late this year, and there is still snow and ice everywhere, and nights go well below freezing. But I’d think in May, latest, these will move into the greenhouse.

Chili season 2018

Time to start preparing for the next summer’s chili season. This time I have promised myself that I will not fool around with any silly Ikea “passive hydroponics” system or similar. Just old-fashioned soil, some peat, water and a light. But I will make use of the Ikea cultivation pots and led lights, as much as possible.

I will also try to radically cut down the number of plants that I’ll grow this time. Last summer was cold, damp, dark and bad in so many ways, but one part of the problem was that I had just too many plants in the end. Packing plants too densely into a small greenhouse will just predispose all plants to pests and diseases. Smaller number is also good for getting enough sunshine and good airflow around all plants.

I am again putting my trust in Finnish chili seeds from Fatalii.net (Jukka Kilpinen’s “Chile Pepper Empire”). I am trying to grow five plants:

  • Naga Morich (C. chinense)
  • Carolina Reaper x 7pot Douglah (C. Chinense hybrid, F2 generation)
  • 7pot Primo Orange (C. chinense)
  • Moruga Scorpion (C. chinense)
  • Rocoto Riesen, Yellow (C. pubescens)

You might spot a pattern here: this is apparently the year of superhots for me (the Rocoto Riesen is the odd one out – thanks to Fatalii for dropping it into my order as a “surprise extra”). Originally I was planning on focusing on just my regular kitchen varieties (Lemon Drop, etc.), but losing all my hot chilies last summer left some kind of craving for retribution. If all these grow into proper plants, and yield proper crops, I will be in trouble. But: let’s see!