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Tips for Growing Beautiful Blue Hydrangeas: A Guide for Beginners

Published on
September 4, 2024
Tips for Growing Beautiful Blue Hydrangeas: A Guide for Beginners
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Why is bonsai training wire used, and when should I remove it?

Wiring is used to guide the branches into specific shapes and positions, allowing you to control how your tree grows. You can use aluminum or copper wire to gently bend and hold branches in place. Typically, wire should be left on the tree for a few months, depending on how fast your tree is growing. You’ll want to check regularly, though—if the wire starts to dig into the bark, it’s time to remove it before it damages the tree. Always be gentle when unwiring to avoid hurting the branches.

Why are bonsai pots so shallow?

Bonsai pots are shallow to restrict root growth and help control the size of the tree. This forces the tree to focus its energy on growing branches, leaves, and, eventually, creating that miniature look. Additionally, shallow pots aid in water drainage, which is crucial for bonsai health since waterlogged roots can easily lead to rot. Aesthetically, the small, shallow pots also highlight the beauty and shape of the bonsai itself, keeping the focus on the tree rather than the container.

How long does it take for a bonsai tree to fully grow?

Bonsai trees are all about patience. It can take anywhere from 5 to 10 years for a bonsai to be considered “mature,” and even then, they continue to grow and evolve throughout their lifespan. The slower the growth, the more intricate and beautiful the tree becomes. That said, if you’re looking for quicker results, starting with a pre-bonsai or young tree can speed up the process a bit!

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Tips for Growing Beautiful Blue Hydrangeas: A Guide for Beginners

infographics on blue hydrangea planting and maintenance tips
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If you're reading this, you're probably as enchanted by blue hydrangeas as I am. These gorgeous plants can transform any garden into a dreamy landscape with their vibrant, sky-colored flowers. Today, I’ll take you through everything you need to know about planting and caring for blue hydrangeas. So, grab your gardening gloves and let’s get started!

What Are Blue Hydrangeas?

hand touching blue hydrangea outdoors

Blue hydrangeas are a type of flowering plant known for their large, globe-like clusters of beautiful blue flowers. These plants belong to the genus Hydrangea and can vary in color depending on the soil pH. These plants thrive in acidic soil, which gives them their distinctive hue. They're popular in gardens for their striking appearance and ability to bloom from spring to late summer.

Plant Type: Deciduous shrub

Size: 3 to 6 feet tall and wide

Soil Type: Well-draining, rich in organic matter

Soil pH: 5.2 to 5.5 for blue flowers

Bloom Time: Spring to late summer

Hardiness Zones: 3 to 9 (depending on the variety)

Native Area: Asia and the Americas

Toxicity Level: Moderate (all parts of the plant are toxic if ingested)

Best Types of Hydrangea

Not all hydrangeas will produce blue flowers; the ability to do so depends largely on the soil's pH. Here are some of the best varieties of blue hydrangeas you can consider for your garden:

1. Hydrangea macrophylla 'Nikko Blue'

The Classic Beauty

Hydrangea macrophylla 'Nikko Blue'The Classic Beauty  thriving outdoors

Imagine walking through a garden filled with vibrant blue blooms that seem to glow in the sunlight. That's 'Nikko Blue' for you. This hydrangea is a true classic and a favorite among gardeners for a good reason.

  • Appearance: 'Nikko Blue' hydrangeas are known for their large, mophead flowers that can turn heads from a distance. The blooms are a brilliant shade of blue in acidic soil, but they can also shift to a pinkish hue in more alkaline conditions.
  • Growth Habit: This variety grows to about 4 to 6 feet tall and wide, making it a substantial presence in any garden.

2. Hydrangea macrophylla 'Endless Summer'

The Ever-Blooming Wonder

Hydrangea macrophylla 'Endless Summer'The Ever-Blooming Wonder thriving outdoors

If you want to grow blue hydrangea flowers that just keeps on giving, 'Endless Summer' is your go-to. This variety grows on both old and new wood, which means you get flowers throughout the growing season.

  • Appearance: The large, lush flowers of 'Endless Summer' are a true delight. They start as a soft blue in acidic soil and can turn pink if the soil is more alkaline.
  • Growth Habit: This plant reaches about 3 to 5 feet in height and width, making it perfect for borders or as a standalone showstopper.

3. Hydrangea serrata 'Bluebird'

The Elegant Lacecap

Hydrangea serrata 'Bluebird'The Elegant Lacecap thriving outdoors

If you're looking for something a bit more delicate and refined, 'Bluebird' is the hydrangea for you. Its lacecap flowers add a touch of elegance to any garden.

  • Appearance: 'Bluebird' features flat-topped flower clusters with small, fertile flowers in the center surrounded by larger, showy sterile flowers. The blooms are a soft blue in acidic soil and can lean towards pink in alkaline soil.
  • Growth Habit: This variety is slightly smaller, reaching about 3 to 5 feet in height and width, making it great for smaller spaces.

4. Hydrangea macrophylla 'Blue Enchantress'

The Dark and Handsome

Hydrangea macrophylla 'Blue Enchantress'The Dark and Handsome thriving outdoors

For a hydrangea that combines drama with beauty, 'Blue Enchantress' is a top pick. Its deep blue flowers and dark stems create a striking contrast that's sure to catch the eye.

  • Appearance: 'Blue Enchantress' boasts deep blue, mophead blooms that are truly mesmerizing. The dark, almost black stems add an extra layer of visual interest.
  • Growth Habit: This variety grows to about 3 to 5 feet tall and wide, making it a versatile option for various garden settings.

Plating Blue Hydrangeas

planting blue hydrangeas: a step by step guide infographics

When to Plant Blue Hydrangeas:

  • The best time to plant blue hydrangeas is in the spring or fall when the temperatures are mild. Avoid planting during the hot summer months or freezing winter conditions.

Where to Plant Blue Hydrangeas:

  • Outdoor Planting: Choose a location that receives morning sun and afternoon shade. Blue hydrangeas prefer dappled sunlight or partial shade, especially in hotter climates. Ensure the soil is well-draining and rich in organic matter.
  • Indoor Planting: While hydrangeas are typically grown outdoors, they can be planted in containers and kept indoors if provided with sufficient light and care.

How to Plant Blue Hydrangeas: Step-by-Step Guide

Materials and Tools Needed

  • Blue hydrangea seeds or seedlings
  • Garden gloves
  • Hand trowel or shovel
  • Compost or well-rotted manure
  • Aluminum sulfate (optional)
  • Watering can or garden hose
  • pH tester (optional)
  • Container (if planting indoors)

Planting Blue Hydrangeas from Seed:

Step 1: Prepare Your Seeds

  1. Purchase Quality Seeds: Start with high-quality blue hydrangea seeds from a reputable supplier.
  2. Pre-Soak Seeds: Some gardeners recommend soaking the seeds in water overnight to speed up germination.

Step 2: Prepare the Seed Tray

  1. Fill the Tray: Fill a seed tray with a well-draining potting mix. Ensure it's moist but not waterlogged.
  2. Sow the Seeds: Sprinkle the seeds evenly over the surface. Press them gently into the soil but do not cover them, as they need light to germinate.

Step 3: Germination

  1. Place in a Bright Spot: Position the seed tray in a bright, warm area, ideally where it can receive indirect sunlight.
  2. Keep Moist: Mist the soil regularly to keep it consistently moist. Covering the tray with plastic wrap can help retain moisture.
  3. Wait for Germination: Seeds should start to germinate within a few weeks.

Step 4: Transplant Seedlings

  1. Grow Strong Seedlings: Once seedlings have a few sets of true leaves, they are ready to be transplanted.
  2. Prepare Individual Pots: When they are large enough, transplant the seedlings into individual pots filled with potting mix, allowing them to grow stronger before planting them outdoors. You can also plant them outdoors following the steps for planting seedlings.

Planting Blue Hydrangeas from Seedlings:

Step 1: Choose the Right Spot

  1. Location: Select a spot that receives morning sun and afternoon shade. Blue hydrangeas prefer partial shade to avoid scorching in the hot sun.
  2. Soil Preparation: Ensure the soil is well-draining and rich in organic matter. If you want to maintain the blue color, test the soil pH and aim for a pH of 5.2 to 5.5.

Step 2: Prepare the Planting Area

  1. Dig the Hole: Dig a hole twice as wide and just as deep as the root ball of your seedling. This gives the roots plenty of room to spread.
  2. Amend the Soil: Mix the removed soil with compost or well-rotted manure to enrich it.

Step 3: Planting the Seedling

  1. Place the Seedling: Gently remove the seedling from its pot, being careful not to damage the roots. Place it in the center of the hole.
  2. Fill the Hole: Fill in around the seedling with the amended soil, pressing down gently to eliminate air pockets.

Blue Hydrangea Planting Requirements

blue hydrangea planting and maintenance tips infographics

Soil:

One of the first things you need to know about blue hydrangeas is that their stunning flower color is heavily influenced by the soil they're planted in. Blue hydrangeas adore well-draining soil. Too much moisture can lead to root rot, and nobody wants that! Look for loamy soil that balances clay, sand, and silt. If you're like me and have clay-heavy soil, adding compost is a game changer. It lightens the mix and improves drainage.

To achieve that beautiful blue hue, the soil pH should be between 5.2 to 5.5. You can pick up a pH tester at your local garden center, which makes checking the soil a breeze. If it’s too alkaline, don’t worry! Adding aluminum sulfate will lower the pH and cause the flowers to turn blue.

Water:

Aim to water deeply rather than giving them a little splash every day. I usually water mine thoroughly once or twice a week, depending on the weather. Always water at the base of the plant to avoid wetting the foliage, which can lead to fungal issues. I use a soaker hose or a watering can with a long spout to make this easier.

Temperature and Humidity:

Blue hydrangeas are a bit particular about their climate—kind of like Goldilocks, they want it just right! These beauties thrive in moderate temperatures. Ideal conditions range from 60°F to 75°F (15°C to 24°C). If you live in a warmer climate, providing some afternoon shade will prevent those hydrangea blooms from scorching in the heat. They also prefer humidity, so if you live in a dry area, keep an eye on your plants. Misting the leaves can help, but my favorite trick is placing a humidifier nearby during dry spells. It works like a charm!

Sunlight:

Blue hydrangeas thrive in partial shade, which means they enjoy about 4-6 hours of sunlight daily. Morning sun is the best—it's gentle and helps dry any dew on the leaves, reducing the risk of disease. Too much direct sunlight, especially in the afternoon, can lead to sunburned leaves and faded blooms. In my garden, I found that a little dappled light through nearby trees does wonders for keeping my hydrangeas thriving.

Location:

Blue Hydrangeas don’t like strong winds that can damage their beautiful blooms. When selecting a spot, consider planting them near a wall or other plants that can provide a little shelter. These plants can spread out, so give them enough room—typically about 3 to 6 feet apart depending on the variety. I’ve learned the hard way that overcrowding can lead to issues with air circulation and disease.

If you’re growing them in pots, make sure your containers have good drainage holes. You can use terracotta pots because they’re breathable and help prevent overwatering.

Blue Hydrangea Maintenance Tips

Fertilizer:

Blue hydrangeas appreciate a balanced fertilizer (10-10-10) applied in the spring as new growth begins. This gives them the boost they need to start the season off right. You can give them another dose of fertilizer in early summer. I like to use a slow-release formula, which means I don’t have to remember to feed them as often. Less work, more blooms!

Pruning:

Prune blue hydrangeas after they finish blooming, usually in late summer or early fall. This helps shape the plant and encourages more blooms next year. Snip off spent flowers to keep the plant looking neat and to encourage buds.

Mulching:

Apply a 2-3 inch layer of mulch around the base of the plant to conserve moisture and suppress weeds. I love using bark chips or wood mulch for a natural look. Top off the mulch each spring to keep it fresh and effective. It’s an easy task that pays off with happier, healthier plants.

Overwintering:

In colder climates, protect blue hydrangeas by mulching heavily around the base and covering them with burlap or a protective frost cover to protect them from harsh winds and frost. Water your hydrangeas well before the first hard freeze. This helps them withstand the dry winter air.

Common Pests and Diseases

Pests

  1. Aphids:
  • Signs: Curled leaves, sticky residue, and a colony of tiny green bugs.
  • Prevention: Encourage ladybugs in your garden—they love to munch on aphids.
  • Solution: Spray with a mix of water and a few drops of dish soap. Repeat as needed.
  1. Spider Mites
  • Signs: Yellowing leaves and fine webbing on the underside of leaves.
  • Prevention: Keep the plant well-watered and mist regularly.
  • Solution: Use insecticidal soap or neem oil to treat the infestation.
  1. Slugs and Snails
  • Signs: Ragged holes in leaves and slime trails.
  • Prevention: Sprinkle crushed eggshells or diatomaceous earth around the base of the plant.
  • Solution: Handpick the critters off your plants at dusk or use slug bait.

Diseases

  1. Powdery Mildew
  • Signs: White, powdery spots on leaves.
  • Prevention: Ensure good air circulation by not overcrowding plants.
  • Solution: Apply a fungicide or a homemade mix of baking soda and water.
  1. Leaf Spot
  • Signs: Brown or purple spots on leaves.
  • Prevention: Water at the base of the plant and avoid wetting the foliage.
  • Solution: Remove affected leaves and apply a fungicide if necessary.
  1. Root Rot
  • Signs: Wilting, yellowing leaves, and blackened roots.
  • Prevention: Ensure well-draining soil and avoid overwatering.
  • Solution: Improve drainage and remove affected parts of the plant. Replant in better-draining soil.

FAQS

Q: Are blue hydrangeas safe for pets?

A: Blue hydrangeas can be toxic to pets if ingested. They contain compounds called cyanogenic glycosides, which can cause symptoms like vomiting, diarrhea, and lethargy in pets. If you have curious pets, consider planting hydrangeas in an area that's less accessible to them or opt for pet-safe plants.

Q: Can I use coffee grounds to fertilize blue hydrangeas?

A: Yes, they can be beneficial for blue hydrangeas as they help to acidify the soil. Here's how to use them: Lightly sprinkle used coffee grounds around the base of the plant. Don’t overdo it; a small amount goes a long way in adjusting soil acidity.

Q: Are blue hydrangeas deer-resistant?

A: Unfortunately, blue hydrangeas are not deer-resistant. Deer find them quite tasty! If you have a deer problem, consider using deer repellents or installing a fence to protect your plants.

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