Annuals 101

Your Guide to a Colourful Summer Garden

There’s nothing quite like annuals for adding instant colour, texture, and personality to your outdoor spaces. From overflowing hanging baskets to vibrant garden beds and show-stopping patio planters, annuals are the stars of the summer garden! Whether you’re planting sun-loving containers or brightening a shady porch, this guide will help set you up for success all season long.

What Are Annuals?

Annuals are plants that complete their life cycle in one growing season. They grow, bloom, and provide continuous colour from spring until frost. Because of their long-lasting blooms and fast growth, they’re perfect for:

  • Containers & hanging baskets
  • Garden borders
  • Window boxes
  • Patio planters
  • Filling gaps in garden beds

At Canadale, we carry a wide mix of annuals — including premium varieties from Proven Winners alongside many other beautiful and reliable favourites in a variety of sizes and price points.

Choosing the Right Soil

Healthy roots create healthy plants! Annuals perform best in loose, nutrient-rich soil that drains well while still holding enough moisture.

For Containers & Hanging Baskets:

Use a high-quality potting mix rather than garden soil. Potting mixes are lighter, drain better, and help prevent compacted roots.

Look for mixes that:

  • Retain moisture
  • Drain excess water
  • Contain added nutrients or compost
For Garden Beds:

Improve existing soil with:

  • Compost
  • Triple mix
  • Sea soil or organic matter

Good soil preparation helps annuals establish quickly and bloom more consistently.

Fertilizing Annuals

Annuals are heavy feeders because they grow and bloom so quickly!

Best Fertilizer Options

Water-soluble fertilizers are excellent for containers and hanging baskets, while slow-release fertilizers work wonderfully in garden beds and planters.

Popular choices include:

  • Bloom booster fertilizers
  • Balanced fertilizers
  • Slow-release granular fertilizers
How Often Should You Fertilize?
Containers & Hanging Baskets:
  • Water-soluble fertilizer every 1–2 weeks
  • Heavy bloomers may benefit from weekly feeding during peak summer
Garden Beds:
  • Slow-release fertilizer at planting
  • Supplement every 4–6 weeks if needed

Plants growing in containers lose nutrients more quickly due to frequent watering, so consistent feeding is key to keeping them lush and colourful.

Watering Tips

Annuals love consistent moisture — especially those growing in containers.

General Rule:
  • Water deeply rather than lightly
  • Avoid letting containers completely dry out
  • During hot summer weather, some baskets may need watering once or even twice daily

Morning watering is best whenever possible.

Top 5 Annuals for Sunny Spaces

These annuals thrive with 6+ hours of sun daily:

1. Petunias | Supertunias

Long-blooming, colourful, and excellent for containers and baskets.

2. Calibrachoa (Million Bells) | Superbells

Tiny petunia-like blooms that spill beautifully over containers.

3. Geraniums

Classic performers with excellent heat tolerance and bold colour.

4. Lantana

Loved by pollinators and extremely heat tolerant.

5. Dahlias

Showy and vibrant, perfect for sunny garden beds.

Top 5 Annuals for Shade

Perfect for porches, shaded patios, and low-light garden areas:

1. Impatiens

Reliable colour for shady gardens and containers.

2. Begonias

Versatile and long-blooming with beautiful foliage options.

3. Coleus

Grown for its stunning colourful foliage.

4. Fuchsia

Elegant trailing blooms perfect for hanging baskets.

5. Torenia (Wishbone Flower)

A great flowering option for bright shade.

Annuals That Help Deter Pests & Animals

No plant is completely deer- or pest-proof, but some annuals are less appealing due to scent or texture.

1. Marigolds

Often used to help discourage some insects.

2. Ageratum

Can help deter rabbits in some gardens.

3. Dusty Miller

Its fuzzy foliage is less attractive to deer and rabbits.

4. Salvia

Fragrant foliage helps deter browsing animals.

5. Geraniums

Scented varieties can help discourage certain pests.

Best Annuals for Spreading & Trailing

Looking to soften edges and create lush overflowing containers?

Great trailing annuals include:

  • Calibrachoa (Million Bells)
  • Supertunias
  • Sweet Potato Vine
  • Creeping Jenny
  • Wave Petunias
  • Silver Falls (Dichondra)
  • Black-Eyed Susan Vine
  • Rio Dipladenias

These are perfect for hanging baskets, window boxes, and planter edges.

The “Thriller, Filler & Spiller” Planter Formula

One of the easiest ways to create beautiful containers is by following the classic design rule:

Thriller

A tall, eye-catching focal plant.

Examples:

  • Spike
  • Cordyline
  • Canna
  • Grass
  • Birds of Paradise
  • Alocasia
  • Banana Plant

Filler

Plants that fill out the middle and add fullness.

Examples:

  • Geraniums
  • Begonias
  • Petunias
  • Angelonia
  • Petunias
  • Coleus

Spiller

Trailing plants that soften the edges and cascade over the container.

Examples:

  • Calibrachoa (Million Bells)
  • Creeping Jenny
  • Silver Falls
  • Sweet Potato Vine

This simple combination creates balanced, professional-looking planters with lots of texture and colour.

Final Tips for Annual Success

  • Wait until frost risk has passed before planting tender annuals outdoors
  • Deadhead plants when needed to encourage more blooms
  • Fertilize consistently for best performance
  • Don’t be afraid to mix colours, textures, and foliage
  • Shop early for the best selection during peak season

Annuals are one of the easiest ways to transform your outdoor spaces into colourful summer retreats. Whether you love bold tropical vibes, cottage garden charm, or elegant monochromatic planters, there’s an annual for every style and space!

Back to Garden Centre Articles