Getting a head start on the growing season is easy to do by planting a few seeds indoors in the winter. Most seeds aren't too picky about what they grow in, as long as they get enough warmth, moisture, and sunlight. While there are plenty of containers you can purchase made specifically for starting seeds, you can save a little cash by making your own out of items that are likely already in your recycling bin. Newspaper, paper towel rolls, small boxes, and shredded paper can all be easily transformed into biodegradable seed pots. Follow our step-by-step instructions and you'll soon have plenty of pots for growing all the seedlings you want.
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Check the seed packet to help you figure out when to sow your seeds in your DIY pots. Usually, it'll be about six to eight weeks before the average last frost date in your area (so if that's April 15, count back from then and make sure you start your seeds on or after March 18). Once your seeds have sprouted, make sure to provide them with as much sunlight as possible (or use grow lights). When the weather outside has warmed up and there's no threat of frost, it's time to harden off your seedlings, which means slowly getting them used to outdoor life by placing them&#;pots and all&#;in a protected spot in your yard for an hour or two and gradually lengthening that time until they can stay outside all day. At that point, they should be strong enough to transplant into your garden beds or porch pots.
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Newspaper Pots
Finished with the Sunday paper? Now you can turn it into handy little pots for your seeds. While you're rummaging in your recycling bin, fish out any small glass jars to serve as a mold&#;a juice glass with straight sides will do just as well if you don't have any jars.
Supplies Required
Step 1: Cut Newspaper
Cut newspaper into rectangles that are large enough to wrap all the way around the jar with a little overlap.
Step 2: Soak Newspaper
Submerge the newspaper in a shallow pan of water until moistened.
Step 3: Shape Pots
Roll the softened paper around the jar. Extend the bottom edge of the paper enough to fold and form the pot's bottom. Crimp and press the paper around the bottom of the jar. Flatten the bottom by pressing it on a flat surface and set aside to dry. Carefully slide the paper pot off the jar once dry.
Step 4: Plant Seeds
Fill your new paper pots with seed starter mix and lightly pat down the soil. In the center of each pot, create a shallow hole in the soil with your finger or the end of a pencil. Place the seed in the hole and cover it with soil. Spritz the pots with enough water to completely moisten the soil.
Upcycled Box Seed Starter
Lots of household items come in small paper boxes that are just the right size to hold seeds&#;and sturdy enough to hold together until the resulting seedlings can be planted outside. Give new life to the boxes that once held pantry staples like tea bags by turning them into seed trays for sprouting several seeds together.
Supplies Required
Step 1: Cut Boxes
Use scissors to cut one of the longer sides off the box to form a shallow tray.
Step 2: Make Dividers
Use the remaining cut pieces to create dividers as needed.
Step 3: Plant Seeds
Fill each box with seed starter mix and lightly pat down the soil. Create a shallow hole in the soil with your finger or the end of a pencil in each section. Add a seed to the holes and cover them with soil. Spritz the homemade seedling tray with water until the soil is completely moistened.
Paper Towel Tube Pots
As useful as paper towels are around the house, the leftover tubes can be just as versatile for DIY projects like these biodegradable seed planters. Just make a few snips, fold in one end, and you're done.
Supplies Required
Step 1: Cut Tube
Cut the paper towel tube into three-inch sections. At one end of each section, make four evenly spaced cuts approximately ¾-inch long to form the flaps that will close across the bottom of the pot.
Step 2: Fold Flaps
Fold in each flap to close one end of the tube section. It's okay if there is a small gap between the flaps&#;it will help with drainage.
Step 3: Plant Seeds
Fill your new tube pots with seed starting mix. In the center of each pot, create a shallow hole in the soil with your finger or the end of a pencil. Place a seed in the hole and cover it with soil. Spritz the soil in each pot with water until it is completely moistened.
Papier-Mâché Pots
A little heat helps make these DIY containers extra sturdy. The process starts out similarly to other handmade paper projects, but then you stir in a little flour and bake after forming it into pot shapes.
Supplies Required
Step 1: Blend Paper Shreds
Fill your blender with shredded paper and completely cover with water. Let the shredded paper sit in the water for five minutes to soften. Blend until the paper has a smooth consistency. Start heating your oven to 200 degrees.
Step 2: Strain Paper Mixture
Pour the blended paper into a mesh strainer over a bowl. Press the paper in the strainer with a sponge until the paper mixture has a wet clay-like consistency.
Step 3: Form Pots
Place the paper mixture into a clean bowl and add about 2 tablespoons of flour. Use your hands to combine the flour and paper until you have an even consistency. Place small balls of this clay-like mixture into muffin pans and press it onto the bottom and sides of each cup as thin as possible. Repeat until you use up all the mix.
Step 4: Dry Pots
Bake in the oven for one hour. The pots will not be completely dry when you take them out; the oven just accelerates the drying process. Once the pots are cool, remove them from the muffin pan and place on a cooling rack. Allow to finish drying overnight.
Step 5: Plant Seeds
Fill your papier-mâché pots with seed starting mix. Poke a shallow hole in the center of the soil in each pot with your finger or the end of a pencil. Place a seed in the holes and cover it with soil. Spritz the pots with water until the soil is completely moistened.
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I think we can all agree options are good- but give us too many options to choose from and we can easily feel overwhelmed. And as a result we may find ourselves failing to make any sort of decision at all&#;
This is at least how I felt when I was just getting started growing flowers and was trying to decide on which seed starting trays to purchase.
I mean, no one wants to spend money only to find out later that they invested in the &#;wrong&#; trays&#;am I right?!
And so today, I&#;m hoping to put your mind at ease. In this blog, specifically- I thought we&#;d discuss the pro&#;s and con&#;s to some of the different seed trays out there on the market. I&#;m also going to share with you some of my favorite trays to use; and even give you some considerations to think about when you&#;re selecting your own trays.
So if you&#;re wanting to learn more- let&#;s go!
(Psst.. Want to skip the explanation and get right to the good stuff?! I got you covered, this tray is my absolute favorite for starting seeds; and truth be told, it&#;s the one tray I use most on my small flower farm)
Now in general, all seed trays serve the same sort of purpose- they hold your soil in place so that you can grow healthy transplants for your flower garden.
By planting your seeds in a single tray, it makes it easier to treat your seedlings all the same as they&#;re in the same container. You can water the entire tray at once. You can transport your seedlings at once- you know, when it&#;s time to plant you just have to handle a single tray and bring it out to the garden with you.
For the most part, all of the seed trays that you will encounter, they have the same overall length and width. And they can typically all fit inside a standard bottom watering tray.
The biggest difference among trays is really found with the number of cells they contain.
Cell counts vary widely in trays and you can commonly find trays that have 32-cells, 50, 72, all the way up to 128, 288 and beyond.
Now, the more cells in a single tray- the smaller each individual cell will be. So for example, the cells of a 50 cell tray will be larger than those in this 72 cell tray.
Choosing which cell count to use is based partly on preference and how much room you have available to seed start. And then it&#;s based partly on the needs of the seeds you&#;re growing.
You see, the size of a cell limits the growth of a seedling. Smaller cells leave less space for seedlings to grow.
Ideally we want to give the seedling as much room as it needs to expand its roots and put on top growth so that it really thrives before we put it out in our garden.
During the growing process, if your seedling runs out of room to grow, generally, what happens is that the seedling becomes root bound. When this happens, the roots of your seedling become so entangled that they have a hard time absorbing nutrients from the soil.
Now some seedlings can bounce back after becoming root bound but it&#;s better if we can prevent this altogether as root bound plants can experience stunted growth, delayed flowering, or in extreme conditions, they can just flat out not survive.
Understand that the purpose of seed starting is to produce a robust plant start. So giving our seedling the proper amount of room to grow is important.
Like I said, in an ideal situation we&#;d give our plants as much room as possible. But for a lot of us who grow seedlings on any kind of scale, the problem is that we often don&#;t have unlimited space.
I have a number of wired shelves where I grow all my plant starts. The shelves are 4 feet wide and so on one shelf I can fit 4 trays.
If I&#;m growing my seedlings in 32 cell trays that means one shelf can hold a grand total of 128 seedlings. You know, 4 trays times 32 cells.
Now compare that to if I were growing my seedlings in 72 cell trays. Suddenly that same amount of real estate on my wire shelf is enough to grow 288 seedlings- more than doubling the amount of seedlings I&#;m able to grow in the same amount of space.
Can you see how it&#;s a fine balance between maximizing the space you have available so that you can grow as many seedlings as possible with also doing what&#;s best for the health of your seedling?
For me, the 72 cell tray (with a few exceptions) is sort of the compromise between these two factors that I just mentioned. The reason that I often encourage new growers to start with the 72 cell tray is that for most flower varieties, the 72 cell is sufficient space for a seed to grow into a large and bulky enough plant start without requiring you to repot it before it&#;s time to to transplant into the garden.
And if I&#;m being really specific, my absolute favorite seed starting tray is the 72 cell seed tray that comes from Bootstrap Farmer. I believe that I&#;ve shared in past YouTube videos how I stumbled across the Bootstrap Farmer brand- but 5 seasons into growing flowers, I can honestly say that I haven&#;t found a tray that compares in strength and quality to this tray.
Even full of soil the Bootstrap Farmer trays don&#;t buckle- they&#;re a really durable tray and for me, it&#;s worth it to spend the extra dollar or two per tray because I know that I won&#;t need to replace them near as often.
So let&#;s discuss some instances when I would choose to use a different tray.
If you&#;re struggling with germination with some of your seeds- tools like heat mats and humidity domes can be useful in helping you achieve those ideal situations for your seeds to germinate.
While I look at my equipment as a necessary investment in my business- sometimes you just don&#;t have the extra money to spend so that every tray has its own heat mat and humidity dome.
And so one of the ways around this may be to use a smaller-cell tray to start with. A 128 cell tray is great because you can start a good number of seeds in a small space- and this single tray fits nicely on heat mat.
In my experience, you just have to be careful that you&#;re monitoring your 128 and smaller cell trays to make sure that they have enough space for your seedlings to grow until they&#;re ready for transplant. You may find that you&#;ll need to bump up your seedlings into a larger tray so that they can continue to grow until it&#;s time to plant them outside.
Speaking of more room, if there&#;s one flower variety I definitely recommend you give plenty of room to it&#;s sweet peas. Sweet peas are known for their large root system and for that reason I always use a 50 cell tray when starting my sweet pea seeds.
In recent years, I&#;ve actually switched to using these 50 cell extra deep trays for my sweet peas as it allows for more root development.
We actually use these deep 50 cell trays for an increasing number of our crops- we start our ranunculus and anemone corms in these and I even pot up my paperwhites bulbs in these trays
All of these varieties that I just mentioned are flowers that can benefit from a little extra space for their roots.
Now before you go crazy and grow all sorts of flowers in these extra deep trays- I will caution you, in my experience these trays are little more difficult when it comes to regulating moisture. Personally I feel like these trays don&#;t wick up moisture from their bottom drain holes as well and so I often find myself overhead watering when I&#;m using these trays verses bottom watering. And I just find it a little more difficult to actually gauge the amount of moisture at the very bottom of these deep cells.
I think it&#;s much easier to maintain a consistent amount of moisture in any of these other more standard trays that are just 2 to 3 inches deep.
This next tray that I want to share with you is a little unique- it&#;s a 20 row channel tray. This is something I&#;d recommend if you are someone that hates sowing small seeds.
We all know the struggle that comes when you&#;re trying to sow something like snapdragons or herbs like oregano- the seeds are just so tiny it can be difficult to even decipher what&#;s a seed vs just a speck of dirt. I&#;ll admit, some seasons I have the patience to sit at my seed starting station I&#;ll use a moist toothpick to pick up each individual seed and put it into its own individual cell within my cell tray.
But other seasons, I find myself in a hurry or I just don&#;t want to bother with the especially tiny seeds. And in these instances, I will pull out my channel trays.
The purpose of this tray is that you&#;ll fill each channel with soil, you&#;ll indent your soil to create a small &#;channel&#; for seeds to be poured into. Unlike a cell tray where you&#;re placing one seed into each cell. With this tray you&#;re simply pouring seeds the length of your channel. Usually a single one-hundred seed packet is enough for one channel. As you can imagine this is a huge timesaver for getting seeds started.
Now I&#;ll treat my channel tray like any other seed tray- and I can fill more channels if I&#;d like- but I&#;ll usually put this on a heat mat and place a humidity dome over time. Once the seeds have germinated and my seedlings have put on just a little growth- I&#;ll pop these out of their channel and pot them up in my favorite 72-cell trays where they&#;ll continue to grow until I&#;ll plant them out in my garden.
For a lot of people, having to handle these baby seedlings is much easier than having to deal with the eye strain that can come from trying to separate tiny seeds into individual cells.
A channel tray is a two-step process instead of just one like when you&#;re seeding directly into a cell tray- so you may have to do a little trial-and-error to see if this process works for you, but it is a great work around especially if you&#;re someone that struggles with planting small seeds.
I&#;ll also use a channel tray if I have a flower variety that doesn&#;t have great germination. By planting lots of seeds in a single channel and then only bumping up the seeds that actually germinated I can avoid those instances where I have trays that have lots of empty spaces because the seeds I planted there simply didn&#;t germinate.
Now the last tray that I want to share with you today is a new tray that I&#;m trialing this season. And I&#;m honestly pretty excited about these.
So far in this post, I&#;ve shared with you the different types of trays that I use for my own seed starting practice. Realize however, that there is another method of seed starting that eliminates the need for any sort of tray at all.
This practice is what we call soil-blocking. Instead of planting your seeds into soil held in place by a tray, you plant your seed into a cube of soil.
There&#;s some great benefits to soil blocking- the biggest one being that it prevents your seedlings from becoming root bound.
In a cell tray, when your seedling&#;s roots hit the side of the cell, they&#;re forced to grow downward in a spiral, and left in the tray too long they&#;ll often circle the bottom of the cell becoming root-bound as they tangle together.
Soil blocking, however, avoids this problem. When your seedling&#;s roots reach the outer edge of the soil block and actually come in contact with the outside air, they experience what we call &#;air-pruning&#;. What this means is that root- it dries out and stops outward growth and signals secondary root development within the soil block. Overall you get a more developed, fuller root system for your seedling.
Despite these amazing benefits, I just don&#;t have the patience myself to plant my seeds into soil blocks- it can sometimes be a finicky process and I just much prefer the convenience of seed trays.
Air prune trays are sort of a hybrid method of seed starting that allows you to experience the benefits of soil blocking because the trays are designed in such a way that your seedlings can air prune themselves- but they have the added convenience of a tray.
I&#;ll be curious to see if my seedlings that grow in this tray are in fact healthier than those grown in my more standard trays. For this season, I&#;ve only purchased a handful of these air pruned trays so that I could get a feel for how they perform for me.
My plan is to use them on flower varieties that are particularly sensitive to root disturbance. My thoughts are that if I can grow a more robust root system on those sort of plants, they&#;ll likely transplant into my garden much more smoothly and overall perform better as they&#;ll have less chance of transplant shock &#; that&#;s at least my theory.
I will say that these trays are an investment. Still, they are incredibly well-made trays so I have no doubt that I&#;ll be able to use them for many seasons and in that sense, I&#;m not worrying about getting my money&#;s worth out of them.
But I&#;ll definitely keep you updated on how these perform for me as the season progresses.
So there you have it- an inside peek into the different seed trays that I use in a season. I hope this blog post gives you some things to consider when you&#;re deciding on which trays you&#;d like to use in growing your own flower starts.
Be sure to let me know in the comments below what you decide on as I&#;m always curious as to what other growers use!
P.S. Want to see all these trays mentioned in action?! Be sure to check out this YouTube video where I show you even more about my favorite seed starting trays!
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