The Best Seed Starting Trays For Beginner Gardeners

Seed starting trays are one of the easiest ways to start vegetable, flower, and other plant seedlings indoors before the weather warms up. They come in a variety of sizes, with different features, and materials, but which ones are best?

Are some seed starting trays better then others and why? This is what I set out to find out this years growing season, in my quest to grow more of my own vegetables at home!

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Are Seed Starting Trays Absolutly Necessary?

In past years, I never really used seed starting trays and always went with a collection of mixed solo cups, old flower pots , yogurt containers, egg cartons, basically whatever I could find and put soil in! While all these containers do work, and can be a great way to garden on a budget, I never really found that much success with my mix and match approach.

The main problem with this approach is that it simply makes things harder to manage. The various containers all require different amounts of water to stay moist, they take up way more space, and you have to move each seedling individually should you want to move them out, under grow lights or into a new window sill.

In short, are seed starter trays necessary for the beginner gardener? No, not exactly, but they sure do make life a whole lot easier, and dramatically improve your chances of success!

Why would we recommend using seed starting trays?

Seed starter trays make life a whole lot easier by conveniently grouping seedlings into easy to manage trays.

• It is much easier to provide adequate lighting when all the seedlings are grouped closely together instead of being spaced out in various size containers. The trays easily fit under grow lights, and can easily be moved around as a group.
• As the seed tray cells are all a uniform size, it is much easier to water, and stay on top of the moistures requirements of the various seedlings. As the seed trays all contain proper drainage, they also help prevent over watering the seedlings.
• It is much easier to plant similar types of plants in their own trays, for example herbs in one, lettuces in another, etc. This helps when needing to harden off or transplant certain seedlings before others.
• Some seed trays even come with clear plastic covers or domes, which help regulate moisture, especially in the beginning phases of germination and growth.

Different Seed Starting Tray Materials and Designs

Most often seed starting trays are made of rigid plastic and are reusable, or are made of super thin recyclable plastic that is meant to be thrown away after using. Some are a combo of plastic drip tray with bio-degradable cells or peat pellets that can later be planted right into the garden.

There are a wide range of designs to choose from, and it can be overwhelming, especially for new gardeners.

Which you'll end up choosing depends on several factors and we'll go over some of the most common designs in this guide to help you decide what will work best for you.

Seed Tray Sizes

Most seed starter trays come in a 10" x 20" size, but differ in the amount of 'cells' or individual plants that can be planted in the tray.

The more cells a tray has, the shorter the time frame before the seedlings out grow the tray and need to be planted out or transplanted into larger containers.

Tray sizes range from 12 cell trays - 128 cell trays! In my experience, tray sizes between 24 cells and 48 cells work best and will safely keep your plants indoors for 4 to 8 weeks before needing to be transplanted.

• Trays with a high number of cells (and thus a shorter growth time indoors) work especially well for lettuces such as spinach, kale, and head lettuces, which can be transplanted out into the garden sooner, either under hoop tunnels or in cold frames, then other plants.
• Trays with a smaller number of cells (for example 24 - 36 cells per tray) are ideal for plants such as tomatoes, cucumbers, bell peppers, herbs, and squashes.

Root vegetables, should when possible always be planted directly in the garden and not transplanted.

If you see roots coming out of the cells or peat pellet inserts, it's time to transplant the seedlings into a larger container or into the garden.

Bio-degradable inserts vs plastic cell trays

Which style of seed starter tray you choose is ultimately up to you.

Bio-degradable cell inserts are great, and make transplanting easy as the entire 'cell' is simply transplanted directly into a larger container or into the garden, and the tray material bio-degrades. They do need to be replaced yearly though and have a tendency to develop mold easier then plastic cell trays do.

Plastic seed starter trays are mostly re-usable, especially the more rigid plastic celled trays. The seedlings can be slightly harder to remove from the trays at transplanting time though, and you may need to use a butter knife, or spoon handle to help loosens the sides of the individual cells.

Never pull on the seedling stems to try and remove the cell from the tray as you will most probably damage the plant!

Additional accessories for your seed trays

Consider these accessories when starting and growing seedlings indoors. They make life a whole lot easier, and increase your chances of success! If you have to pick just one of them, I will always recommend grow lights be the first upgrade to your indoor seedlings!

• LED Grow Lights- specially designed lights to provide the proper amount of lights seedlings require to prevent growth issues.
• Heat Mats- help by keeping soil temperatures consistently warm, speeding up and aiding in germination rates.
• Base Trays- provide drainage for trays with drainage holes, and allow you to water your seedlings from below. Tis can help prevent disease and pest problems!
• Clear Dome Lid- Help keep heat and moisture in the seed tray. Especially important when waiting for seeds to germinate. A great and cheap investment when heat mats are not possible.

The Best Seed Starting Trays For Beginner Gardeners

In our quest to discover which seed trays work best for our vegetable garden needs, we purchased and trialed three of the most commonly available styles of seed starting trays. Biodegradable cell inserts on a plastic base tray, peat pellet inserts with a base tray, and a rigid plastic celled tray with a base for watering.

Summary

Over all we found that all three styles of seed starting trays had their own pros and cons making them great for different things. With all trays we tried, we found planting 2-3 seeds per cell and then trimming back to just one seedling after sprouting to give the best results.

The small Jiffy peat plugs where great for starting lettuces, herbs, and brassicas that can be transplanted out sooner even in cool weather. Tomatoes and cucumbers struggled in these peat plugs due to the limited growing space for the roots and required transplanting into larger pots fairly quickly.

The larger 32 peat pots where wonderful for plants that require more time to establish before being planted out. Tomatoes, cucumbers, herbs, and squashes all did well in this tray for up to 8 weeks. The only downside was the need to separate and space out some of the plants once they grew so large they where shading the other seedlings.

The re-useable 72 cell tray with 2 inch plugs worked surprisingly well, even for our larger plants, such as tomatoes and peppers. The deeper cell plugs allowed the plants to stay in the trays longer then expected. Removing the plugs without damaging the roots was a bit of a challenge though and took some getting the hang of.

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