How to Increase Moisture in Container Garden Soil
I thought I’d talk about a great product you may not have heard of before – water crystals, aka water gel – that can make your outdoor container gardening watering requirements a bit easier. These little white granules are a type of absorbent polymer that can absorb up to 400 or 500 times their weight with water (there are different brands on the market – there may be variances in their absorption rates). When hydrated, the water crystals swell up, holding the water, and will look like little pieces of ice. Plus, water crystals are non-toxic and safe to touch with your hands. They are eco-friendly too, decomposing harmlessly over time. They can be purchased at big-box stores, many garden centers and online.
If you have a number of planted container gardens and hanging baskets, you’ve probably run into the issue of having to do more frequent waterings in the hotter months. Many of us live in very hot climates, or our summers get awfully hot, and I find that during the height of summer I may have to water my container plants two, if not three times a day! That can pose a problem if no one is at home during daytime hours. A drooping, stressed-out plant is not a good thing, and sometimes a plant can’t even handle this situation once, let alone many times. So, watering of potted plants can become quite an issue for the home gardener.
How to Mix Water Crystals Into Soil Before Potting the Plant
These crystals can absorb a lot of water, thus will get very large. This is one issue to keep in mind, as the expanding crystals can literally push the soil out of the pot, so be very careful with how many you add to the container’s soil. I would suggest you use less than the package’s label says to. It’s up to you, but many of us using them do find that if we use the amount stated on the label, that the moistened crystals do indeed push the soil over the top of the container. Perhaps you might want to expert by adding soil to a small pot, mix in some crystals, water and see what happens. This might help you get a better idea of how many to add in.
Also, thoroughly mix and incorporate the water crystals into the soil – don’t get too many in one spot. As they swell they can push a plant right out of it’s pot!
Here’s a highly suggested method/trick to help you figure out the right amount of water crystals to use: water the crystals FIRST before you mix them into the soil. The crystals will adsorb the water like a sponge and immediately turn into their gel-like substance. I assure you that you’ll be very surprised at how much larger they become. Then, keep adding water until it is obvious that they can’t possibly absorb anymore water.
Then, mix them into the soil. Then go ahead and fill the container. You can either wet the soil again before putting the plant in, or just skip this second watering and plant the container.
However, here is a general guide of how much to use in relation to a pot’s size – again remember to experiment first to determine how much the crystals you’ve purchased will expand when moistened:
6″ pot = 1 tbsp. dry granules
8″ pot = 3 tbsp. dry granules
10″ pot = 4 tbsp. dry granules
How to Use Water Absorbing Crystals in Already Potted Plants
Here’s a few tips on how to incorporate these crystals into container soil that has plants growing in it. This is reverse of the above instructions, but I recommend that you add in the granules DRY.
First, thoroughly moisten the soil. Then, using the handle of a wooden spoon or pencil, poke holes down into the soil all around the plant. A good rule of thumb to follow is to poke one hole for every inch around the diameter of your container. Make the hole about 2/3’s of the way down the depth of the soil.
Using about 5-10 or so DRY water crystals per hole, carefully drop them down into each hole. Then water well.
Note: I will mention that if I were wanting to ADD these crystals into an existing planting, I’d go to the trouble of unpotting the plant(s) and going through the steps as listed above for adding moistened crystals to loose soil. Then I’d repot the plant. It really isn’t that much of a hassle, and you’ll have the assurance that the crystals are distributed better throughout the potting soil.
Watering Tip for Container Gardens and Hanging Plants Using Water Crystals
A last tip I’ll pass along is to how to get the greatest water absorption of the crystals once they’re mixed into the soil in your containerized plants.
Try this: water the container until water just starts to come out the bottom drainage hole, then move on to the next container until water is just beginning to drain from that one, and so on. Then, go back to the first one, water until the water starts draining out of the bottom, and so on.
You’ll likely be surprised at just how much more water the crystals in each container can hold. It seems that the crystals don’t necessarily suck up all they can absorb instantly.
I hope this information on using a simple product like these water absorbing crystals helps make your container gardening efforts more successful and less tedious to tend to.