How to Assess Sunlight and Choose the Right Plants for Your Apartment: A Practical Guide

Written by on in Urban Gardening Tips

Last updated on 4 May 2025

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Living in a high-rise urban environment like Singapore, it’s crucial for gardening enthusiasts to understand the amount of sunlight their balcony or apartment receives to cater to different plant species’ needs.

Thankfully, most plant nurseries provide clear advice on the plant’s sun and watering needs on the label when you buy them.

This blog post will talk more about gardening terms for sunlight and an easy white paper method to determine the intensity of sunlight in your apartment.

For a night owl like myself, I clearly don’t share my plants’ love for light (Source: Tenor)

Common Gardening Terms for Sunlight

Sunlight is vital for plant growth, providing the energy needed for photosynthesis. The amount of daily sunlight your plants receive will influence their health, growth rate, and blooming.

In Singapore’s tropical climate, where sunlight is abundant, managing and understanding sun exposure becomes even more crucial.

Some owners do this to their plants regularly, be it in a much less dramatic manner. (Source: Tenor)

Here’s a breakdown of common sun exposure gardening terms to help you choose the right plants for your garden’s light conditions.

  • Full Sun: This term refers to areas that receive at least 6 hours of direct sunlight every day. Plants that thrive in full sun are typically robust and suited to bright conditions. Examples include tomatoes, peppers, and sunflowers.
  • Partial shade: These areas get 4 to 6 hours of direct sunlight daily. It’s a middle ground suitable for plants that need a good amount of sunlight but can tolerate some shade.
  • Part Shade: This is similar to partial shade but leans more towards shade. It means 3 to 6 hours of direct sunlight per day, usually during the less intense morning or evening hours.
  • Full Shade: Less than 3 hours of direct sunlight per day characterizes full shade.

While often used interchangeably, partial shade and part shade have slight differences.

Partial shade plants usually require a minimum of 4 hours of direct sunlight, whereas part shade plants can manage with as little as 3 hours.

The Paper Method: A Simple Sunlight Assessment Tool

The paper method is a straightforward way to gauge the intensity of sunlight in a particular area. Here’s how to do it:

  1. Choose a Sunny Day: Pick a clear, sunny day for your assessment.
  2. Use a Plain White Paper: Place a sheet of plain white paper in the area you want to assess.
  3. Observe the Shadow: Hold your hand about 30 cm above the paper. Look at the shadow cast on the paper.

Shadow examples:

Sharp, Clear Shadow: Indicates bright, direct sunlight. (Source: Kaya Leaf)
Blurred, Less Defined Shadow: Suggests indirect or filtered sunlight (Source: Kaya Leaf)
Very faint or no shadow: Implies full shade. (Source: Kaya Leaf)

This method helps you understand the type of light (full sun, partial shade, full shade) your space receives.

Want a more precise and scientific method to measure the amount of usable light (i.e. Photosynthetically Active Radiation (PAR)) needed for your plant babies?

Check out my blog article on a step by step guide to optimising light conditions for plant growth!

Apartment Orientation: Understanding Sunlight Patterns in Singapore

Given Singapore’s equatorial location, the sun is almost directly overhead throughout the year. However, the orientation of your apartment can still influence the quality and duration of sunlight:

  1. North-Facing: These spaces would receive filtered sunlight throughout the year. These are suitable for plants that tolerate shade well.
  2. South-Facing: South-facing balconies can enjoy a good amount of light, especially during midday, favorable for a variety of plants, including those requiring bright light.
  3. East-Facing: Receives morning sunlight, which is gentler and cooler, ideal for plants sensitive to harsh afternoon rays.
  4. West-Facing: Exposed to intense afternoon sun, suitable for heat-tolerant plants.

Therefore, if your apartment is southwest facing, expect a mix of relatively bright light and some afternoon sun.

Give your plants the right amount of light and they’ll be full of life like this! Or at least at the microscopic level. 😎 (Source : Tenor

Conclusion

Determining the amount of sunlight your space in Singapore receives is essential for a thriving garden.

The paper method provides a quick assessment of light intensity, while understanding your apartment’s orientation helps in long-term planning

By accurately gauging sunlight, you can choose the right edible plants for your space, ensuring a lush, vibrant balcony or indoor garden.

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