GERMINATION STATION
SOIL BLOCKS & SEED TRAYS
The problem with these is that seeds germinate and sprout at different rates. These okra, for instance, are already touching the top of the container before my peppers have even sprouted. The deeper grow cell also encourages the roots to shoot straight down rather than out, which is a problem over soil blocks that we will detail in a comparison later in this blog. We will need to transplant them by squeezing the bottom of the pod and carefully removing the seedlings to a slightly larger pot. For that, we can use plastic cups, small 4-6″ pots, or paper fiber-based pots. If you use cups, ensure a hole in the bottom for excess water to drain out. The advantage to the paper pots is they will deteriorate in the garden, so to plant, we only need to remove the bottom and put them in the garden.
We found these self-contained systems for as low as $1.99. This one would allow me to start a dozen plants, which makes it ideal for the small-space gardener. The smaller setups would also allow us to put seeds of all the same kind in the container, eliminating the problem of faster shoots. These self-contained systems also come with a clear lid to keep the humidity in the growing area but allow your grow lights to shine through enough to reduce mold and algae problems. That’s what you want. If you want to avoid mixing soil, and you can plant in successively larger pots to prevent circular roots, you can use soil pods and a clear, hinged take-out container with similar results. The advantage of this style is the retention of humidity.
The other option is soil blocks. This is more hands-on, but it’s the cheapest route with the least amount of waste in the long run. For this, you need a soil block maker. We picked this one up on clearance for around $7.00. It allows me to make small, 1-inch blocks. These come in 2″ 4″ and even 6″ models and average over $20, but they will last you a lifetime of planting. The advantage of soil blocks is that a well-made one will hold moisture at its core where the seedlings need it. Because the outside is exposed to the air and roots die off when exposed to air, the soil block air prunes the root structure on the walls. This helps to keep the plant from rapidly growing tall before it can adequately support itself. You end up with hardier plants.
The key to a good soil block is the mix, and we will put my recipe in the comments below. Typically, it’s 1 part peat moss or coco coir, which is coconut fiber, one part compost or garden soil, and 1/2 part vermiculite, perlite, pumice stone, or sand. The blocks get more complex from there with exotic ingredients like green sand, colloidal phosphate, basalt rock powder, worm castings, and feather meal, but we find this mix works the best because the ingredients can all be found at low cost. For our mix, we’ll use one half-measuring container of peat moss. Instead of compost for the organic nutrients, we are using a 6 lb. bag of worm castings, proportionally the same amount as the peat moss. You could use compost for this part, as what we are doing is putting organic nutrients in the soil. Then, add the same amount of garden soil. The garden soil tends to be very woody, so lean toward the finer mixes, as these will absorb and retain water better and clump up as needed. Some garden mixes also contain fertilizer or perlite in the mix. These will both help your new plants, one providing nutrients and the other allowing the roots to grow better.
Mix this thoroughly together with your hands. Finally, I will put in 1 scoop of generic plant food, the same as we would use with a water bucket. This will make sure that I have the essential nutrients for my plants. I pull out a little of the dry mix before adding water in case we accidentally add too much water. In that case, we can add a few handfuls of our dry ingredients until we get the perfect mix consistency. Our final ingredient is a couple of handfuls of perlite and sand to help with soil aeration.
Add water slowly and mix until all the water is fully absorbed. Continue to add water and mix until you have a consistency in that you can squeeze water out in your hand, but the clump stays together when you toss it between your hands. Think of it like making snowballs. You want the balls to keep their form, not explode apart. The surface will have a little jiggle, and you should have no pooling water. The clumpiness is what you want. If it keeps its form when you toss it between your hands, but it also comes apart when you break it up, it’s perfect. Next, you load the soil blocker. We really pack it in there and allow the excess water to squeeze out. These blocks have to keep their form, and we’re not afraid of over-packing because of the mix we just made. You can load the soil blocker by rocking it in the mix, but we also pack it in, then you can just push the plunger handle down, and you have your soil blocks. In one sitting, we can easily make about 100. Leave them in the sun for a few hours to harden up. You can always remoisten them with a mist, and the core will retain water.
Of course, if you don’t want to mess with any of that, you can purchase pre-made Expanding Seed Starting Soil Pods. You simply have to soak the pods and then plant your seed. The two drawbacks are that these sometimes lack nutrients and they are more costly. You can get around the nutrient part by soaking them in a little compost tea or light plant food water or making sure they are organic, so you know they have organic materials in them to break down and provide nutrients. We will link to the ones we have used successfully in the past in the section below.
COMPARISON
Honestly, moving forward, we will probably only use soil blocks. They worked so well. The exception would be if we were to plant 72 of the same plant, so the germination rate was more consistent, and we could really let the roots establish with the lid off the germination container. It’s easier to move outside to harden plants off, as well. The soil blocks take some time to make and more work, but they’re far superior, in my opinion. The root structure is denser and branches out. This provides better stability to the small plant and increases the likelihood of the plant surviving.
BUILDING THE GERMINATION STATION
For our bulbs, we are going to use hanging light sockets with cords. This will allow us to adjust the bulb’s height over the plants and to turn them off an on separately. The light will provide the plant with what it needs for photosynthesis, warm it slightly, and reduce algae, moss, and fungal growth. Our bulbs are called full-spectrum, providing a wide range of the wavelengths of light needed for plants. As you explore grow lights, you will see they get progressively more specialized, allowing you to adjust the wavelength. Violet or purple light has a shorter wavelength and higher energy. It is considered effective as a light source to facilitate the growth and development of a plant’s leafy vegetation. For our purposes of basic germination and not a whole indoor growth operation, basic full-spectrum grow light bulbs are perfect.
Finally, you will need a power strip to connect everything up to and these seedling warming mats. Seeds each have a preferred temperature they want the soil to be before they germinate and sprout, so you have to warm the soil. If this setup is in winter in your garage, nothing will probably sprout without these. We will use one each for the two different trays.
If your concern is electricity consumption, don’t be worried. Our entire setup, that’s five lights, two heat mats, and a fan only consumes just around 130 watts. So, this whole setup uses about the same electricity as one bright lamp bulb.
We constructed the shelf with a 2-foot or more growing area space, and we used zip ties and tape to secure wires and keep the system neat. Wires are easily threaded through the wire shelves and secured with simple twist ties. This will allow us to individually turn them off and on and adjust their heights as we need to. We will wrap two sides with aluminum foil to reflect and concentrate the light and reduce drafts. This is easily fastened down with a little crinkling and then tape.
TWO POTENTIAL PROBLEMS
The second problem is failing to label your plants. Most pepper sprouts all look the same, so you have to label them. The same is true for young tomato plants. You have to label them to avoid mixing them up. When you do transfer to the garden, you run the risk of planting them too close together or planting too many of one type and not enough of another. Do yourself a favor and label each of your plants from the moment the seed drops into the pot you plan to move it in. Then, transfer the label marker to the plant in your garden.
NEXT STEPS
When the last chance of frost has passed, you can slowly introduce your potted plants to the outside environment. First, introduce them on a warm day by placing them in the shade for a few hours. Progressively, increase their time outdoors and sun exposure. This process is called “hardening off.” When the plants can survive outdoors with the direct sunlight they require, and the fear of frost has passed, you can leave them outdoors overnight.
Move the pots around your garden area for a few days to ensure the plants appear healthy in their new homes, then transplant them to the soil. You will be weeks ahead of other gardeners by germinating indoors with a grow station. Your plants will be healthier and better established than any larger, store-bought variety. You will also be harvesting well ahead of other gardeners.
So, for around a hundred to two-hundred dollars, depending upon what you have on hand, and with some ingenuity, you can easily set up an indoor grow station. Use it throughout the season to develop heartier plants for your growing area. If the weather becomes erratic and unpredictable or a disaster wipes out your garden, you can grow some plants indoors. You are only limited by your space.
NOTES:
OUR SOIL BLOCK/PLUG TRAY RECIPE:
LINKS: