By Ava Green

Usually, by the time February or March rolls around, I’m pretty tired of the health crazes like extreme diets and exercise plans I’ve been trying for the fifth year in a row. This year, let’s take a look at something that naturally supports our good health, both mental and physical. It’s time to stop and “smell the flowers,” so to speak.

Mental and Physical Health

Many gardeners already realize this, but studies are showing that simply seeing greenery can benefit our mental health. Whether it's a walk in the woods or a handful of houseplants, seeing green leaves makes a difference for humans! Research shows that it helps boost our mood and improve how we get along with people. Who doesn’t need a mood booster during cold, dark days? And getting along with people, well, the world just needs more of that, too, doesn’t it?

You may also already know that tending to plants reduces stress, but did you know that science is proving it? PubMed published a study stating:

"Interaction with indoor plants may reduce psychological and physiological stress by suppressing autonomic nervous system activity in young adults: a randomized crossover study."

This isn’t the common thinking about working outside in the garden increasing physical strength and stamina. It’s a study that examines our autonomic nervous system, the one responsible for automatic and essential bodily functions we don’t even think about, like breathing. The study compared participants performing two tasks: one on a computer and the other doing plant transplanting. The results suggest that interaction with plants indeed reduce stress without us even thinking about it! No task that requires willpower, just daily tending to plants like transplanting, watering, dusting, pruning, or turning the pots to get sun on the flipside.

So plants boost our mood, improve interactions with others and physically reduce our stress levels without us even trying. It’s no wonder we just feel better when we’re around plants.

Air Quality

Research also shows that indoor air pollution is often worse than outdoor air pollution. VOCs (Volatile Organic Compounds) from washing detergents, paint, furnishings, and building materials, as well as bacteria, fungal spores, and dust, negatively affect human health.

Fresh air can counter the impact of indoor pollutants, but often it’s too cold to open the windows in the middle of winter. When you can’t let fresh air into the house, indoor plants will help. We know that growing trees outdoors has a massive impact on air quality and the health of the planet, and inside our home, tropical plants contribute in the same way. The contribution of each type of plant varies, so having a variety is a very good idea.

What to Grow

Here’s a list of easy-to-grow, green indoor plants that Eising’s resident tropical plant expert, Courtney, and the UK’s Royal Horticultural Society (RHS) recommend:

Aglaonema ‘Silver Queen’ (Chinese evergreen ‘Silver Queen’)

Aspidistra elatior (common Aspidistra, Cast Iron plant)

Chamaedorea elegans (Parlour Palm)

Chamaedorea seifrizii (Bamboo Palm)

Chlorophytum comosum (Spider Plant)

Crassula ovata (syn. Crassula portulacea) (Jade plant, Jade tree)

Dracaena fragrans ‘Janet Craig’ (Dragon Plant)

Dieffenbachia ‘Tropic Snow’ (v) (Dumb Cane)

Dracaena marginata (v) (Madagascar dragon tree)

Epipremnum aureum and ‘Marble Queen’

Ferns - many types

Ficus elastica (Rubber tree, Rubber plant)

Hedera helix (English ivy, common ivy)

Howea forsteriana (Flat Palm, Kentia palm)

Rhapis excelsa (Bamboo Palm, Lady Palm)

Sansevieria (Snake Plant) - many types

Spathiphyllum sp. (Peace Lily)

Syngonium podophyllum (Nephthytis)

Zamioculcas zamiifolia (ZZ plant, fern arum)

Is there a downside to having houseplants? Yes, if you have small children or pets, be mindful of the plants that can be toxic if ingested (see resources listed below).

While many of us in Ontario focus on “nice” weather and getting outside to garden, it’s pretty clear that our indoor plants do much of the heavy lifting to improve our health through the cooler seasons. Even if you don’t have a “green thumb”, it’s worth giving tropical, indoor houseplants their well-deserved space in our homes, hospitals, offices, nursing homes, classrooms, restaurants…or any indoor space!

Resources:

PubMed study on indoor plants and their impact on human stress - https://pmc.ncbi.nlm.nih.gov/articles/PMC4419447/

Sally Augustin, PhD, Environmental Psychologist - https://www.psychologytoday.com/ca/blog/people-places-and-things/201802/benefits-of-the-indoor-plant

RHS - https://www.rhs.org.uk/plants/types/houseplants/for-human-health

For a list of indoor plants and the VOCs they have the potential to reduce, PubMed review article by Dela Cruz et al., 2014 - https://pubmed.ncbi.nlm.nih.gov/25056742/

PETAs list of plants that are safe for pets: https://www.peta.org/living/humane-home/animal-friendly-houseplants/?utm_source=PETA::Google&utm_medium=Ad&utm_campaign=0422::veg::PETA::Google::SEA-Vegan-Grant::::searchad&gad_source=1&gad_campaignid=96533821&gbraid=0AAAAADu2DAt3SGF9vPRkHJqkNw-eZ6kEH&gclid=CjwKCAiAvaLLBhBFEiwAYCNTf9nyavbUnefHx0FaUekq4HZyXPrIwYhnJqgnu_g_TPea3nExhT-jOhoCqLUQAvD_BwE

RHS list of safest plants for children: https://www.rhs.org.uk/plants/types/houseplants/houseplants-for-children

How To Keep Your Orchid Alive

By Ava Green

Orchids have become very popular gifts, and a great hobby for indoor plant enthusiasts who discover the wide range of colours and shapes available. Orchids are also loved for their long-lasting and exotic blooms.

While some may choose to only enjoy these tropical plants as long as they’re blooming, orchid-lovers look forward to nurturing the plant and encouraging it to flower regularly. It may be a little daunting at first, but once orchids grace you with their stunningly beautiful blossoms, you will find that a little bit of care is very worthwhile!

It’s estimated that there are 25,000 different species of orchids and over 100,000 hybrids! The ones you’ll find most readily in Ontario stores are Phalaenopsis or moth orchid, because it’s fairly easy to grow. Phalaenopsis are the best choice for beginners.

Other orchids you may find easily are Cattleyas (Corsage Orchids), Cymbidiums (Boat Orchids) and Dendrobium orchids.

While all of these may be orchids, they don’t necessarily require the same care, so it’s a good idea to check the tag for the type you have and its specific care requirements. The following is a general guide to light, water, fertilizer, and growing medium for the most commonly found orchids, but it does not apply to all breeds.

Light and Air

For most orchids, light, and lots of it, is the general rule. Place your plants within 3 feet of a window (not to the side) in the sun. South, east, and west-facing windows are all fine for maximizing the light your plant receives.

Orchids also enjoy a breeze or circulating air in your house. They do not like temperature extremes, though 15 to 20 degrees Celsius is safe. Keep in mind that the more warmth and air movement there is, the more often you will need to water your orchid.

Water

A general rule is to use water that is not hard and has not been softened with salt. Salt will kill an orchid. Rainwater, reverse osmosis, or distilled water are good choices. Chlorinated water is not an issue for orchids - high sodium levels are.

The biggest issue many people have is either over-watering or underwatering their orchids. Here is the method we recommend:

Every 5-7 days, place the pot in a container or the sink, then fill it with enough water to cover the top of the pot. Be careful not to let water collect in the crook at the base of the leaves, as standing water will rot the leaves and the plant. Once the plant’s growing medium is thoroughly soaked, remove it from the water and allow the pot to fully drain in the sink before placing it back in its saucer. 

We prefer using a container of water rather than the sink, so the remaining water can be used to water other plants.

Here’s the best watering advice we can give you: look at the overall health of both the plant AND its root system. Full, plump leaves and vibrant, green roots indicate that your plant is getting enough moisture. Puckered leaves and a silver sheen on the roots indicate insufficient water. Mushy, brown leaves and roots are signs of rot caused by too much water.

You may hear of another watering method that involves using ice cubes, but it’s controversial and not widely recommended. To quote the American Orchid Society, “Ice is for cocktails, not orchids. Never use ice on tropical plants to water them.”

“Soil” and Nutrients

Most orchids naturally grow high up in trees, where their roots cling to bark and absorb moisture from the air. At home, we try to mimic those conditions, which is why orchids are typically planted in chunky mediums like bark, coconut husk, charcoal, or perlite rather than traditional soil. While many of the roots stay inside the pot, it’s completely normal for some to grow up and over the edge.

These “escapee” roots might look a little wild, but don’t worry, there’s nothing wrong with your orchid. In fact, those aerial roots are a sign that the plant is healthy and doing exactly what orchids do in nature.

It’s worth noting that not all orchids grow the same way. Many, like Dendrobiums, are epiphytic (growing on trees) or lithophytic (growing on rocks), though some orchid varieties are terrestrial and grow in the ground. The good news is that the growing medium your orchid comes in is chosen specifically for that variety, so you can trust it’s in the right environment.

The bark that your orchid is planted in will slowly break down and become mushy. It’s a very good idea to repot your plant every two years.

It’s generally recommended to feed most orchids, and bloom time dictates which fertilizer to use and how often to feed. Begin by using a water-soluble 20-20-20 fertilizer, mixing it at ¼ the amount recommended for other houseplants. Apply this solution every 2 weeks in the summer and every 3 weeks in the winter.

“The orchid, with its many forms, is a reminder that life is full of surprises.” — Leonardo da Vinci.

Lastly, here’s an orchid fun fact: While we have been talking about tropical orchids in this article, there are also orchids that grow right here in Ontario! That’s right, there are over 50 species in this province, including the much-loved Pink Lady’s Slipper (Cypripedium acaule).  

Resources for more detailed and specific information: 

Toronto Master Gardeners - https://www.torontomastergardeners.ca/gardeningguides/growing-orchids-a-toronto-master-gardeners-guide/

Canadian Orchid Congress - https://canadianorchidcongress.ca/basics/growing-orchids/

American Orchid Society - https://www.aos.org/orchid-care/indoor-orchid-care

Ontario Wildflowers - https://ontariowildflowers.com/main/group.php?id=18