The Canny Gardener

how to be a smart gardener


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Until death do we part

I have been very guilty of loving my houseplants too much- by overwatering, over-fertilising and doing every other over-the-top thing.  I have lost many plants and also money.  So now I have reduced what I buy- though I still love to have plants in the house.  Contrary to the view that houseplants hugely increase the amount of carbon dioxide during the evening and night and therefore it is not good to have them inside the house, it has now been calculated that they only increase it by a very small amount.  This amount of carbon dioxide does not have any health disadvantage and the benefits of having house plants outweighs everything else.

During the late 1980’s, NASA did some research on houseplants as a means of providing purer and cleaner air for space stations. The plants filter out certain harmful compounds in the air and make it much healthier to breathe. My top three maintenance free and double use houseplants are-

  • Spider plant (which can absorb 90 percent of the toxins inside the house by absorbing mold and other allergens, small traces of formaldehyde and carbon monoxide; and best of all, live on practically nothing and yet produce ‘little babies’ that can be detached and given away as gifts!)
  • Aloe vera (the juice of which can be used for burns and insect bites)
  • Peace Lily (which improves the indoor air quality by as much as 60 percent by reducing the levels of mold spores, keeping bathrooms free from mildew and absorbing harmful vapors from alcohol and acetone.  The peace lily also produces beautiful white or pale flowers- bonus! And after reducing my watering, it has finally produced a beautiful flower after many years of being flowerless.
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Over the years, I have drastically reduced the numbers of houseplants but I was still overpowering them with water.  But simply keeping water levels low or watering them every 2-3 weeks works well.  A tip I got about watering houseplants when going away was to leave an ice cube in the pot- this has also worked well.  This time was the first time I didn’t find my houseplants nearly dead from overwatering after I returned from a three-week holiday (previously I used to sit my houseplants knee deep in water!).  My nearly dead poinsettia has even come back to life with glorious red leaves as you see below. I am now working on the orchid on which I will report later.

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Making a terrarium

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I travel quite frequently for work, so while I like to see greenery indoors, I found that I can’t really take time over indoor plants.  From books to plant feeds and self-watering systems, and once, even leaf shining wipes (embarrassing!), I have tried many ways to look after these plants.  Inevitably these have been a waste of time and money.  I have been responsible for many shriveled and dead plants.  So now I have made a terrarium.

While I looked at many Youtube videos and web based advice before starting out, I was also keep to make it out of what I had at home and not buy more stuff.  I also took inspiration from the Princess of Wales greenhouse at Kew Gardens, London.  I learnt that there were some key ingredients for a terrarium-

  1. An inert base made of charcoal, especially if there were plants needing frequent watering.  The charcoal helped to absorb odours, keep the terrarium free of fungal or insect infestations, like it does in aquariums.
  2. Moss- which helped to regulate moisture in the air, absorbing the excess
  3. Main plants that you want to use inside and any ‘decorations’

Charcoal is useful if you are going for a closed self sustaining system but as I was using cactus and succulents, my terrarium needed to be open and so I didn’t need the charcoal.  So I made the base of used match sticks, found the moss in the garden and I already had the pasta jar which I cleaned before use.  I reused the compost that came with the succulents and cactus to which I added some sand.  Believe it or not, the aloe plant came as a decoration from a plate of rice ordered in a restaurant!  I needed to have a vision of what I wanted the terrarium to look like before starting.  If you like, you can draw a rough sketch before inserting anything inside as it can be very fiddly to take things in and out and also this risks damaging the delicate plants.  You can use chopsticks, or tweezers or any kind of grabbing instrument to place the plants.

I first laid out the matchstick base, then put in the soil over which I laid the moss. I kept space in between these where I wanted to place the plants.  These plants do not need depths for soil- they are happy with shallow soils as their roots don’t go very far.  What you need to be careful with is the amount of water you use as these plants need good drainage.  After I inserted everything including the ornaments, I sprayed the inside generously.  Then I forgot about it!  It has been one month now and the cactus has sprouted a little baby and the succulents, aloe and the moss are doing fine. I spray water every 3 weeks and that seems to keep it fine.  Too much water and everything will rot.  My next project will be to make a terrarium for orchids.