Light Requirements of Houseplants

There are various factors that have a big impact on houseplants but the big three are watering, temperature and light. The amount a houseplant receives will make a big difference to its health, wellbeing and appearance.

Written by 

Martyn Cox

Published on 

9th November 2020

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There are various factors that have a big impact on houseplants but the big three are watering, temperature and of course, light. The amount a houseplant receives will make a big difference to its health, wellbeing and appearance. As a result, it’s best to ensure they are given a position that suits their requirements.

The origin of the plant gives a clue to the conditions its likes. For examples, many cacti and succulents are desert dwellers and they need a warm, sunny spot to thrive, while a lot of leafy specimens actually herald from tropical rainforests, where they grow beneath towering trees. As a result, they are happiest in shadier spots.

Right plant, right place

As far as I’m concerned, the key to success is to choose plants that suit your conditions or a specific location, rather than buying a plant on impulse and hoping it will succeed in a given spot. The good news is many houseplants are tolerant of a range of different light levels, making them easy to incorporate into any space.

Very few plants will actually do well on a south-facing windowsill, and most like bright, indirect light – you can achieve this by placing them close to a sunny window, where light will bounce off a wall painted a light shade. Another option is to place them in front of a north-facing window.

As light levels change during the year, it might be necessary to move plants. Over summer, houseplants set further back in a room will benefit from plenty of light. However, during the shorter days of winter, these positions will become shadier and plants will benefit from being moved forward to a brighter spot.

Problems caused by light

Unfortunately, too much or not enough light can have a detrimental effect on houseplants, so aim to avoid problems by placing them in a suitable position from the get go. However, if the plant is set somewhere unsuitable, they’ll soon let you know they are unhappy – move them to a better position and they should recover.

Symptoms of too much light

  • Leaves shrivel up
  • Wilting during the day
  • Scorch damage to leaves

Symptoms of not enough light

  • Plants don’t produce flowers
  • Growth is weak
  • Leaves start to yellow
Martyn Cox

Martyn Cox aims to maintain a small city garden on the south coast, while his two dogs (a Sprocker Spaniel and chocolate Labrador) try to thwart his best efforts. Gardening columnist with The Mail on Sunday, he’s the author of ten books. A trained horticulturist and black belt in karate, Martyn was formerly on the staff at BBC Gardeners’ World, Amateur Gardening, Horticulture Week and Gardenlife magazine.

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