Click at the star to rate this articleThis article has been given a 4.5 rating based on 16 ratings

This article was last updated on August 7th, 2021 at 3:06 am

A propagator might sound like some low-budget, knock off, sci-fi movie, but in actual fact, these simple devices are incredibly helpful if you’re trying to grow plants and vegetables from seeds or cuttings. You see, planting seeds directly into your garden soil can be problematic at times, as they are easily affected by changes in moisture, temperature, and also by other things such as being planted at the incorrect depth for that type of seed.

This is why many gardeners choose to sow, and start off growing, their seeds in a propagator, where they can manage the variables better and ultimately end up with healthy seedlings that can be moved into the garden or greenhouse and transplanted when the time is right. Seeing something you planted as simple seeds grow into a marvellous looking plant, or even something you can pick and eat, is just so satisfying and using one of the best propagators is a great way to get started.

In this article, we will look at the different types of propagators, their benefits, how to use them correctly, and also review the best propagator products that you can buy at this very moment. If that wasn’t enough, we’ve even added a little buyer’s guide for good measure.

Electric vs non-electric Propagators

The two main types of propagator that you will come across are electric and non-electric, also known as heated and non-heated. So, which should you go for? To be honest, they both do a good job of getting your seedlings going but I’d have to say that in my experience, a heated propagator does show results faster.

Of course, electric models tend to be more expensive than their non-powered counterparts both in the initial layout and the cost of running them. They can also dry the growing medium out faster, so you have to keep a closer eye on moisture levels. There are some types of seed that really need a constant temperature in order to thrive, and for these, an electric propagator is the right choice. For most though, a standard, non-electric model will work just fine.

Why should you use a propagator?

The main reason that people use propagators is to protect the seeds and seedlings when they are at their most vulnerable. With the UK’s climate being what it is, you never know what the temperature will be like from one moment to the next, and the same goes for the amount of rainfall too.

Another benefit of using one of these devices, is that they allow you to start growing earlier than what would be possible in your garden, giving you a head start on the growing season. In other words, no more twiddling your thumbs until spring arrives.

How to sow seeds in a propagator

  • First you need to prepare your seed tray, and that means using the right type of compost/soil. There are plenty of products out there that are designed specifically to be used with seeds and cuttings, so get yourself some of that and fill the tray with it.
  • Once the tray is filled, you want to make it nice and level, but be careful not to compress the soil; it needs to remain light and fluffy for best results.
  • With your seed tray ready, grab your seed packet and read the instructions. I know it sounds obvious, but so many people just sow seeds in their propagators without reading first and this can result in seeds being overcrowded, or not planted at the right depth and this just results in sub-par results.
  • Time to add some moisture. You can either place your seed tray in a tray of water (a little water, don’t overdo it), or water them very lightly from above with a watering can that has a fine spraying rose. 
  • Now all you need to do is to find a nice spot to sit your propagator on so that your seeds get some sunlight. Most people opt for a windowsill, or they place a small table near the window if the propagator is too large. Make sure you keep an eye on the moisture levels, and don’t just leave the propagator with the same side facing the window all the time, it needs to be rotated every now and again so that all the seeds get a fair share of the light.
  • Don’t forget about ventilation. For the first couple of days, keep the air vents of your propagator closed, but when you see the first signs of them sprouting, you should open the vents to their half-way point to let some air flow through there. Too much humidity can cause them to rot. Later you can adjust the ventilation to suit your seedlings needs.

Best Propagator Reviews

After reading this far, you should now be feeling a little more ‘in the know’ when it comes to propagators, and ready to buy your own. Now, you could just click on the first product you see online and hope for the best, or you could do the smart thing and read the section below. Here we have gotten our hands on some of the best rated propagators available and tried them out, to see if they are worth investing your time and money into.

Comparison table: Best propagators ranked by quality and price (February 2021 Updated Review)

ProductWhat We ThinkPrice

EarlyGrow 24 x 15 x 16.75 Inch. Domed Propagator with 3 Height Extenders and Locking Clip Set,

  • Designed for the serious gardener with an extra large heavy duty tray bed measuring 24” X 15”...
  • Has a clear shatter proof lid with two oversized vents which can be opened or closed as needed to...
  • Has a side vented height extension which elevates the lid as the plants being to grow and adds additional...
  • Will allow for up to 60 units of 2” X 2” germinating trays and as plants mature up to...
  • The height extensions can be disassembled for compact storage when not in use and like all components will provide...

GARLAND BRITISH MADE BIG 3 ELECTRIC PROPAGATOR

  • Extra large, thermostatically controlled unit
  • With 3 separate, full-size high-top propagators
  • Grow several varieties in one place
  • Maintains a constant temperature of 19 degrees C
  • Low running costs. Designed and manufactured in Britain.

Plant Theatre 3 Funky Propagator Pods

  • Set of 3 colourful propagator pods
  • Unlike conventional rectangular propagators
  • Each funky propagator pod has a base (colours red
  • Ideal accessory gift with Plant Theatre’s selection of seed kits: Funky Veg Kit...
  • Gift Boxed. Makes an ideal gift for children and gardeners alike

Stewart Essentials Electric Propagator

Stewart Essentials Electric Propagator, 52 cm - Black

  • 52 cm heated propagator
  • Non thermostatic - simple on-off control via mains
  • Clear cover with adjustable ventilation
  • Adjustable ventilation panels for humidity and air temperature control
  • Sealed unit with an economical 22 W heater

Nutley's 40-Cell No Holes Seed Propagator Set (Pack of 3)

  • Include full-size seed trays with drainage holes
  • Plus clear lids and cavity inserts
  • Provide ideal conditions for faster seed germination
  • Tough but lightweight, and re-usable for several season
  • Made in Britain.

 

1. EarlyGrow 24 x 15 x 16.75 Inch. Domed Propagator with 3 Height Extenders and Locking Clip Set,

Let’s kick off by addressing the elephant in the room, shall we? Yes, this is an expensive propagator considering it is not an electric model, but would I say it’s overpriced?  I suppose I’d have to say no after comparing it to many other propagators that I’ve tried out over the years. So many times in the past, I’ve been frustrated by flimsy seed trays that bend with a bit of weight on them, badly fitting lids, air vents that don’t work properly or break easily, and god knows what else. With this product, there is none of that.

The EarlyGrow 95457 is a solid bit of kit. Made from thick, heavy duty, shatterproof plastic (polypropylene), you never feel like you have to handle it with kid gloves, and it gives you confidence to move it around even when filled with a lot of germinating trays or pots. I put it to the test by loading it up with a few larger pots from my greenhouse, and there wasn’t even the slightest sign of it becoming warped.

This plastic is non-toxic, and will not degrade under UV grow lights like some lower quality plastics can, so that should keep you organic growers out there happy. The modular design of this propagator means that you can extend the height of it by clipping on the extra sections that come in the box, up to a maximum height of 16.75 inches if measuring from the bottom of the soil tray, making it ideal for keeping larger seedlings inside until they can be planted outside.

These sections all fit together perfectly, there’s no fiddling around, trying to get things to line up, and the small, plastic, locking clips really do a good job of holding the sections together. So much so, that it was easy for me to lift them all off at once as if they were a single unit.
Each modular ‘wall’ section has two good-sized air vents in them, and the lid has another two, giving you a lot more control over humidity, air flow, and temperature than what you would normally get from a cheaper product.

When not needed, the side extension sections can be removed quickly and easily, and best of all; they can be broken down and stored out of the way until your seedlings start to grow a little more. I really liked this attention to detail, as it shows that Earlygrow have actually thought about how their decisions will affect the buyer’s experience.

The tray bed measures 24” x 15” and there’s enough room to get a fair old number of small germinating trays in there. With the extra height, and sturdy base, you also have the option of putting some larger and heavier pots in there too, which is a nice bonus. It might not be the cheapest option available, but I have to say the EarlyGrow 95457 is definitely one of the best propagators out there.

EarlyGrow 24 x 15 x 16.75 Inch. Domed Propagator with 3 Height Extenders and Locking Clip Set,

2. GARLAND BRITISH MADE BIG 3 ELECTRIC PROPAGATOR

Priced at just under 90 pounds, this large electric propagator is very fairly priced, in my opinion. With a main unit that can house three 37cm x 22cm propagator trays, this is quite a sizable machine, and gives you the freedom to grow a wide range of plants and vegetables.

The three propagators are solidly built from good quality, injection moulded plastic, with shatter proof lids that are high enough to create lots of room for your botanical babies to grow into. The lids each have a circular air vent in the centre of the top, and these too are made from a durable plastic. They’re not indestructible of course, and for reasons that have to do with keeping the weight down to a minimum, none of these products are, but if I’m comparing them to your standard propagator, they’re built pretty well.

Designed to be economical when it comes to power usage, this British made electric propagator base will not be giving you nightmares about the electric bill, but can still keep a constant temperature of 19 degrees Celsius, thanks to the 50w heater and built-in thermostat. 

To test the effectiveness of the Garland electric propagator, I set up a little test. I sowed some basil and parsley into the trays of this product, and also a similarly sized non-heated propagator to see if there was any difference in how the seeds reacted.

For the first few days there wasn’t any noticeable difference, and I thought I’d bought a dud, but then on about day four or five I noticed that there were far more sprouted seeds, and larger seedlings in the Garland propagator than the non-electric one. After a few more days, that trend only increased, so I would say that this product certainly does what it is supposed to.

The Garland electric propagator is a decent product for the price. It certainly speeds up the time it takes for your seeds to grow, from my tests anyway, and on top of that, it looks really good too. 

The build quality, while nothing amazing, is better than a lot of products out there, and I personally don’ t have much to grumble about. I suppose an adjustable thermostat would have been nice, but then the price would be quite a bit higher, and put it in competition with higher end products. As it stands, it is a good mid-range electric propagator that gives you three good sized seed trays to play with, and keeps a steady temperature.

3. Nutley's 40-Cell No Holes Seed Propagator Set (Pack of 3)

A perfect propagator pack for people just starting out, this pack of three also offers the buyer excellent value for money. For just shy of ten pounds, you will get three units, each containing 40 cells, giving you the opportunity to kick start quite a few different varieties of seed in there.

At 38cm x 24cm, they are a decent size for the low price, and quite lightweight at only 540 grams. The cover stands quite high above the seed tray, so there’s enough room in there for your seedlings to grow into for a while before having to be transplanted.

Talking of trays, you might have been confused, like I was, by the ‘no holes’ phrasing in the product name and description, but in actual fact there are drainage holes in the inserts, but not in the bottom tray which catches any drips. The bottom tray is quite strong and sturdy for such a low cost propagator, but the inner trays are more flexible, which has its pros and cons. On the upside, it makes it easier to take seedlings out once they are growing, but on the other hand, it means that you have to be a bit careful handing them or you could cause damage.

As previously mentioned, the lid gives a good bit of space for the seedlings to grow into, but there is an absence of air vents. I suppose it is to be expected when you’re paying less than a tenner for three propagators of this size, but it does mean that you’ll have to remember to lift it up to let air circulate to prevent the humidity levels getting too high. Steamed vegetables are common in UK kitchens, but you should wait until they have fully grown before putting them through the process! The lid is also not that durable by the feel of it, and as I played around with it in my clumsy hands, I could definitely see myself breaking it after not too long. If you’re not quite the accident-prone one that I am, you should be ok though.

If you are going to buy these propagators, I would recommend buying some better-quality seed trays to fit inside. They are inexpensive and easy to find, and I think with that minor change, this product is definitely a good choice for beginners looking for a low-cost propagator to get started with.

For those of you who are looking for a low-cost electric propagator to get your feet wet with, you could do a lot worse than this Stewart Essentials model, available for under 33 pounds on Amazon at the time of writing this article.

This is a good option for beginners, as it doesn’t have a thermostat or other controls that might be confusing. You just plug it in and you’re ready to go. With this being a budget model, you really can’t expect it to be creating micro-tropical conditions in there, so please be aware of that before you decide to buy. The 22-watt heater will add extra warmth, and this will help your seeds to grow faster, but the heat isn’t anything outstanding, and probably won’t be something that you are immediately aware of.

For something to keep a steady temperature that is a little higher than outside of the propagator, it is just fine, and the lower power means that you won’t be having a heart attack when the electric bill arrives, so that’s something to think about. In fact, it’ll only work out about two quid per month to run.

For the low price, I was expecting this to be fairly flimsy. However, I have to say the tray of this electric propagator is nice and solid and at 52cm x 42.5cm, it is a decent size for the money with plenty of space for a variety of pots inside.

The lid, on the other hand, isn’t quite up to the same standard, and you would have to be a bit careful with it so as not to damage it accidentally. The plastic is much thinner than on the base, but I suppose costs have to be cut somewhere to keep the price down. The lid has two adjustable air vents in the top, so you can control humidity and temperature. They’re an ok size for the unit, and feel a bit more durable than the lid itself.

So, to sum up. If you just want something that can constantly keep the internal temperature around 5 degrees warmer than outside, then this is a good buy. It will help you seeds to grow better in colder weather, at times like when you’re not at home and the heating is switched off. However, if you want an electric propagator that produces a lot of heat, and a temperature that you can control, you’re going to have to look elsewhere and spend a bit more money.

Getting your kids involved in gardening at a young age is extremely rewarding, not just for them, but also for you. Teaching them to care for another living thing develops a sense of responsibility, and it is an excellent activity to drag their attention away from those addictive smartphone screens.

Using a propagator to grow seedlings is an excellent way to start them off, and this particular product is a great match for young, budding gardeners.
For 17.99, you get three propagator pods that are all brightly coloured (red, green, and yellow), and each propagator pod can hold eight small (6cm diameter) pots inside in a circular pattern that resembles a flower and its petals. A good thing about this design is that it enables you to not only rotate the propagator around, but also the smaller, individual pots can themselves be rotated. This allows you to get sunlight to the plants that need it and is much easier to do so than with a conventionally shaped, box type propagator.

To stop your seed pots becoming waterlogged or flooded, there are run off channels for the excess H2O that are fairly deep and do their job very well. However, what don’t do their jobs quite so well, are the actual base trays of the propagators themselves. They’re just a little bit too flimsy to be moved around once you’ve got seeds growing in there, so this is a product best left in one spot.

In contrast to the base, the small pots that come with the propagator are good quality and will last for a long time, and the cover feels more substantial too. If only they’d have made the base a bit stronger, I would have had nothing to complain about.

Like I said, this is a good gift for kids or maybe a novelty thing for some people, but most adult gardeners would probably get annoyed at the fact that your pots wobble all over the place when you try to move the propagator pod to another spot. If you can put up with not lifting the thing though, it is a decent little product.

Plant Theatre 3 Funky Propagator Pods

 

Best Propagators Buyer’s Guide

To help you with your purchasing decision, here are a few things to roll over in your mind before buying your propagator:

  • Think about what size of propagator would suit you best. They come in a wide range of sizes, but the vast majority of them are designed to sit snugly on your windowsill where they can catch the sunlight. Some models are larger though, and will need a good place to sit, especially if they are non-electric models and still need the warmth of the sun.
  • As well as the general size of the propagator, the depth of the seed tray and the height of the lid are also very important. Some seedlings need more space in order for their roots to get properly established, and a shallow tray might stunt their growth. The same thing goes for plants that grow tall very quickly, and these will need a lid that gives enough room for proper growth.
  • Not all propagators have air vents in them, and this is generally seen in the lower cost products. While it is not the end of the world to lift the lid to let some air circulate, having air vents certainly makes things easier, and if you’re a bit forgetful, they can be a life-saver (for your seedlings anyway).
  • If you’re going to buy an electric propagator, I would suggest paying more for one with a thermostat that’ll make it easy for you to monitor the temperature inside the containers. If you’re on a tighter budget, one without a thermostat will do, but be sure to check with a thermometer every now and again. A good low-cost electric propagator will still help your seeds to grow quickly, even without a thermostat.

About Terry Smith

I’m Terry Smith from gardentoolbox.co.uk, a professional landscape designer, hobbyist gardener, and barbecue fanatic with 20 years experience building and restoring. So as you go through my site you'll watch me document some of the professional garden installs I make as well as the major projects I take on at home. While sharing those experiences and guiding you, I'll be recommending some great tools I use to enable this along the way so you can really buy in confidence.

View all posts by Terry Smith