Growing and harvesting Zucchini

Full sun. Zucchini needs at least 6 to 8 hours of direct sunlight each day to grow strong plants and produce abundant fruit.

Rich, well-draining soil with plenty of organic matter. Mixing in compost or a vegetable garden soil blend supports strong growth and higher yields. The minimum soil temperature for planting is about 15°C, but seeds will germinate more quickly and reliably between 18°C and 30°C. If the soil is too cold, seeds may rot or fail to sprout.

Water regularly and deeply, keeping the soil consistently moist but not waterlogged. Water at the base of the plant to help prevent mildew and other leaf diseases.

Zucchini prefers a balanced, nutrient-rich fertilizer to support its fast growth and heavy fruit production. 

Look for an all-purpose fertilizer with equal or near-equal ratios, such as 10-10-10 or 20-20-20, especially early in the growing season to promote strong roots and leafy growth. Once the plant starts flowering, you can switch to a formula slightly higher in phosphorus and potassium (like 5-10-10) to support flowering and fruiting. 

Plant zucchini after the danger of frost has passed and the soil has warmed up. In most parts of Canada, this is late May to early June. Zucchini grows best when soil temperatures reach at least 15°C.

Choose a location that gets full sun, with at least 6 to 8 hours of direct sunlight per day. Zucchini plants need warmth and light to thrive and produce fruit. 

Plant in rich, well-draining soil that has been amended with compost or organic matter. If you’re growing in containers, choose a large pot with drainage holes so the plant has room to grow. 

Sow seeds directly into the soil about 2-3 cm deep. Space plants 90 to 120 cm apart to allow for their spreading growth habit. 

If you’re short on space, you can also grow zucchini vertically with a trellis or support. 

Water thoroughly after planting and keep the soil consistently moist as seeds germinate and plants establish. 

Zucchini plants are relatively low maintenance, but regular care keeps them healthy and productive. 

• Water deeply and consistently, especially during hot or dry periods. 
• Feed regularly with a balanced fertilizer like Miracle-Gro to support continuous growth. 
• Apply mulch to help retain moisture and reduce weeds. 
• Ensure good airflow around plants to help prevent powdery mildew. 

Companion planting is the practice of planting plants that grow well together and benefit each other in some way. 

These benefits can include repelling pests, attracting pollinators, improving soil health, or enhancing growth and flavour. For example, some plants naturally deter insects that might damage nearby crops, while others attract beneficial insects like bees or ladybugs. 

In the case of zucchini, good companion plants include marigolds (help deter pests), nasturtiums (attract aphids away), and herbs like basil or dill (attract pollinators). 

Potatoes: Avoid planting near zucchini, as both are heavy feeders and will compete for nutrients, reducing yields. 

Fennel: Fennel can inhibit the growth of many garden plants, including zucchini, and is best planted on its own. 

Other Cucurbits (in some cases): Plants like cucumbers, pumpkins, and melons share similar pests and diseases (like squash bugs and mildew), so planting them too close together can increase the risk of infestations spreading. 

Harvest zucchini when the fruits are about 15 to 20 cm long. At this size, they are tender, flavourful, and have the best texture. Check plants daily during peak season, as zucchini grows quickly and can become oversized within a day or two.

Choose a location that gets full sun, with at least 6 to 8 hours of direct sunlight per day. Zucchini plants need warmth and light to thrive and produce fruit. 

Plant in rich, well-draining soil that has been amended with compost or organic matter. If you’re growing in containers, choose a large pot with drainage holes so the plant has room to grow. 

1. Check the size of the zucchini and choose ones that are firm and glossy.  
2. Locate the stem just above the fruit.  
3. Use pruners or a knife to cut the zucchini from the plant, leaving a small portion of the stem attached.  
4. Handle gently to avoid bruising the fruit or damaging the plant.  
5. Harvest regularly to encourage continued production throughout the season.