Gardening has exploded on TikTok, creating a community of young, resourceful new gardeners. But some of the DIY advice they spout just sounds too good to be true. We tested popular TikTok DIY gardening hacks to separate fact from fiction.


Sprouting Seeds In Used Teabags


The Gardening Hack:

In a TikTok viewed almost 600 000 times, @creative_explained provides a handy use for old teabags – seed starters. Simply make a hole in a used teabag, place a seed inside, and leave it in a plastic bag to germinate. The video claims the “added nutrients in tea leaves helps seeds sprout”.


The Verdict:

We planted ‘Star 2054’ Bush Beans and ‘Bright Lights’ Swiss Chard in six teabags each, for a total of 12 tests. Going in to this experiment, we expected most of the seeds to sprout; not because of the supposed ‘added nutrients’, but because its very similar to the process of starting seeds in a seed tray, only with a different medium. 


A couple of the seeds (Bright Lights in particular) did indeed sprout after around three days. However, there was one glaring problem with this hack that TikTok failed to mention – mould. A plastic bag, combined with the moisture of the teabags and the warmth required for germination, provided the perfect environment for mould growth. Within two days, we began to see mould spores on the tea bags, and the few sprouts that did emerge were eventually overtaken by the mould too. 


But putting the mould aside, space presents another problem. Within a few days, the seeds that did sprout would have to be moved to a seedling tray or pot as there is no space within the bag to establish roots. In the video, the sprout was moved to a pot using tweezers, but when starting seeds, you want as little disturbance as possible for strong root growth. Essentially, sprouting seeds in teabags is just adding an extra step to a process that would be far simpler using a regular seedling tray from the get-go. 


Pebbles And Water Trays To Increase Humidity


The Gardening Hack:

This hack is all over TikTok, but it certainly didn’t originate there. The idea of using trays filled with pebbles and water to increase humidity has been around forever, almost gaining the status of ‘old wives’ tale’. According to this hack, the water in the tray will slowly evaporate, increasing the humidity around just that plant, rather than the entire room.


The Verdict:

Armed with a humidity meter and several indoors plants, we set out to discover how much of a difference this hack really makes. For the first day, we left the humidity meter next to the plant (in this case, a Strelitzia nicolai) to monitor the levels throughout the day. They fluctuated between 45% and 55%, providing a base line. The next afternoon, we recorded the humidity level for about half an hour, and then placed the plant on the tray with the pebbles for another half an hour. The results were certainly surprising given how often this hack is repeated – there was almost no change in the humidity levels. The meter moved one or two points up and down over time, as it had done without the pebble tray. We repeated the experiments in different areas under different conditions and at best saw minor improvements in humidity, around 2-3%.


Most indoor plants hail from the tropics and prefer a humidity level around 60%, some even more. Unfortunately, an improvement of a few percentage points is not enough to make a significant impact on the health of your houseplants. If you’re really struggling with humidity, opt for plants that are not as dependent on those conditions (Peperomia, Philodendron scandens), or invest in a humidifier. 

Bottom Watering


The Gardening Hack:

TikTok’s go-to watering method is known as bottom watering. Just one TikTok recommending this watering method by @alixx_in_the_hous has almost 1 million views, and the numbers keep climbing. This video, and the many others, recommend placing your plants in a bowl full of water and letting them soak up the moisture for 10-30 minutes, rather than watering the soil from the top of the pot. This is said to improve water retention while preventing overwatering, encouraging the roots to grow downwards, and reducing problems with fungus gnats. 


The Results:

To test this hack, we bought two identical Anthuriums that were in desperate need of water. One was left in a sink filled with water for 30 minutes, while the other was watered from the top over the sink for about a minute and left to drain. Both plants were removed, and the soil pulled apart to test the moisture levels (don’t worry, no plants were harmed in the making of this experiment).


This experiment delivered the first approved TikTok hack – bottom watering for thirsty plants is far more effective than any other method. The bottom watered plant was completely saturated, missing moisture in only the very top layer of soil. The other plant was quite saturated, but had several patches of dry soil that crumbled off once removed from the pot. Sitting in water for extended periods is never ideal for houseplants, so its best to only use this method for extremely dried out pots, but in those cases, it works far better than the other methods. 


Other Tried And Tested TikTok Gardening Hacks:


  • Don’t Repot Houseplants Immediately: This is another TikTok hack with plenty of truth to it. When you bring an indoor plant home for the first time, it needs time to adjust to its new environment. Repotting immediately only increases plant stress and transplant shock, making it difficult for the plants to ever adjust or retain their pre-repotting growth. 
  • Banana Peel Fertilizer: Unfortunately, soaking your banana peels in water and using it as a fertilizer does not provide enough nutrients to keep your plants happy. As there is limited decomposition, very little potassium leeches from the peels. Plus, most houseplants are tropical foliage plants and need plenty of nitrogen (more so than potassium) for healthy leaf growth. Throw those peels on the compost heap and opt for a balanced liquid fertilizer instead.
  • Misting Plants Doesn’t Improve Humidity: TikTok is right once again. As the air diffuses around your home relatively quickly, spraying water around your plants will only increase the humidity for as long as the spray lasts. Unless you want to stand next to your plant and mist every few seconds throughout the day, this hack is unlikely to work, and will only increase your risk of disease. 

Feature image by cottonbro from Pexels


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