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How to Plant and Grow Lilac

Lowe's Editorial Team

By Lowe's Editorial Team
Published January 31, 2025

Lilacs are a timeless addition to gardens, admired for their fragrant blooms and low maintenance. If you're wondering how to grow lilac, it starts with choosing the right spot and providing consistent care. Here’s a step-by-step guide to planting and caring for lilacs.

Tools and Materials

Materials

Choosing the Right Spot for Lilacs

Before planting lilacs, it’s important to find a location where they can thrive:

  • Ensure Proper Sunlight: Lilacs require at least 6–8 hours of direct sunlight daily. Insufficient sunlight may lead to fewer blooms. Look for a sunny spot free of shade from nearby trees or buildings.
  • Pick Well-Drained Soil: Lilacs grow best in loamy, slightly alkaline soil with good drainage. If water pools in your chosen area, consider creating a raised bed.
  • Allow for Airflow: Good air circulation reduces the risk of fungal diseases like powdery mildew. Avoid overcrowding to ensure there’s enough space around the plant for airflow. 

Tip

Regularly inspect for fungal issues and prune affected areas promptly.

Caution

Prolonged exposure to extreme heat can cause the plant to wilt; ensure adequate watering during hot weather.

How to Grow Lilacs: Step-by-Step Guide

Planting lilacs involves a bit of preparation but it’s worth the effort:

How to Care for Lilac

Proper care ensures lilacs remain healthy and bloom beautifully: 

Watering Tips

Lilacs need consistent moisture, especially during their first year. Water deeply once a week, ensuring the soil is moist but not soggy. After planting, lilacs become drought-tolerant and require watering only during prolonged dry spells.

Pruning Essentials

Pruning is crucial for maintaining a healthy lilac bush and encouraging blooms:

  1. Timing: Prune immediately after flowering in late spring.
  2. Method: Remove spent blooms to prevent the plant from expending energy on seed production.
  3. Shaping: Cut back dead and damaged branches and cross them using pruning shears to improve airflow and light penetration.

Caution

Wear gloves to protect your hands from cuts or irritants while using sharp pruning shears.

Fertilizing Schedule

Lilacs generally don’t need much fertilization. Use a balanced, low-nitrogen fertilizer in early spring to encourage flower production. Avoid fertilizers high in nitrogen as they promote leafy growth instead of blooms. 

Weeding and Mulching

Regularly remove weeds around the base to reduce competition for nutrients. Refresh the mulch annually to maintain its benefits.

Common Issues and Troubleshooting

Lilacs are hardy; they can encounter some issues:

  • Powdery Mildew: It is characterized by a white powdery coating on leaves. Prevent it by ensuring good air circulation and avoiding overhead watering. 
  • Few or No Blooms: This is caused by insufficient sunlight, over-fertilizing and improper pruning. Stick to the recommended care practices for consistent blooms. 
  • Root Rot: This usually happens in poorly drained soil. Ensure proper drainage during planting and avoid overwatering. 

Recommended Lilac Varieties

Lilacs come in a range of colors and sizes to suit different preferences:

  • Common Lilac (Syringa vulgaris): Known for its classic purple blooms and strong fragrance.
  • Miss Kim Lilac: A compact variety perfect for smaller gardens, offering lavender flowers.
  • Japanese Tree Lilac: A larger option that grows as a tree, featuring creamy white blooms. 

Tips for Successful Lilac Growth

  1. Be Patient: Lilacs may take a few years to establish and bloom prolifically. Consistent care pays off in the long run.
  2. Deadhead Spent Flowers: Removing faded flowers helps direct energy toward new growth rather than seed production.
  3. Prevent Overcrowding: Thin out older stems every few years to maintain a healthy shape and encourage new shoots.

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