When the summer sun shines over Scarborough, Ontario, your trees are in the midst of their most active growth period. With warm temperatures and long days, trees are busy producing leaves, flowers, and fruits. But here’s a common question many homeowners ask: Do trees need fertilization in summer?
The answer is—sometimes, yes. But it needs to be done carefully. Improper summer fertilization can do more harm than good. At Castor Tree Care Services, we believe in a balanced approach that supports both tree health and soil vitality. Let’s break down when summer fertilization is necessary and how to do it safely.
Do Trees Really Need Fertilizer in Summer?
Tree fertilization isn’t about feeding the tree directly—it’s about improving the soil health so that roots have the nutrients they need. In Scarborough’s urban and suburban landscapes, soil is often compacted, depleted, or lacking in organic matter due to construction and lawn maintenance.
Mid-season feeding may be beneficial if:
- Your trees are showing signs of nutrient deficiency such as yellowing leaves, stunted growth, or sparse canopies.
- The soil around your property is sandy or heavily compacted, making it harder for roots to access nutrients.
- You have younger trees that need extra support for root development.
However, if your trees were fertilized in spring and look healthy, additional summer fertilization may not be necessary.
Risks of Fertilizing in Hot Weather
Fertilizing in summer comes with risks if done incorrectly. Over-fertilization can:
- Burn tree roots due to high salt concentration.
- Stimulate excessive leafy growth at the expense of root health.
- Make trees more vulnerable to pests and diseases.
That’s why it’s important to fertilize safely and strategically.
Safe Summer Fertilization Tips
If you decide your trees need a nutrient boost, here’s how to do it properly:
- Test Your Soil First
Before applying fertilizer, a soil test will reveal what nutrients are actually missing. At Castor Tree Care Services, we recommend soil assessments to avoid unnecessary applications. - Choose a Slow-Release Fertilizer
Opt for organic or slow-release formulations that provide steady nutrients over time without shocking the roots. - Apply at the Right Time
Fertilize early in the morning or late in the evening when temperatures are cooler, reducing stress on the tree. - Water Thoroughly
Always water well after fertilization to help nutrients penetrate the soil and reach the root zone. - Focus on Mulching
Sometimes, mulching with organic material such as wood chips is more beneficial than fertilizer. Mulch improves soil structure, retains moisture, and slowly releases nutrients.
Supporting Long-Term Soil Health
Instead of relying solely on fertilizers, consider a holistic approach to tree care:
- Add compost or organic matter annually to build soil fertility.
- Use mulch to protect roots and reduce summer stress.
- Schedule professional tree inspections to catch early signs of nutrient issues.
At Castor Tree Care Services, we focus on improving both tree health and soil health, ensuring your landscape thrives year-round.
Tree Care in Scarborough: Let Castor Help
Every tree and property is unique, and what works for one yard may not work for another. If you’re unsure whether your trees need summer fertilization, our certified team can assess soil conditions, recommend the right solutions, and apply treatments safely.
Contact Castor Tree Care Services today for professional tree fertilization, soil care, and summer maintenance in Scarborough, Ontario. Give your trees the strong foundation they need to grow healthy and beautiful for years to come.
