Hawthorn
Crataegus monogyna
Hawthorn, or Crataegus monogyna, is a beautiful flowering tree native to Europe, known for its stunning blossoms and dense foliage. This hardy plant is cherished for its ornamental value and wildlife benefits, making it a popular choice for gardens.
Everything it needs
9 essentials at a glance
Watering
Hawthorn prefers well-drained soil and should be watered deeply but infrequently.
Water every 1-2 weeks during the growing season, allowing the top inch of soil to dry out between waterings. In winter, reduce watering to once a month. Signs of over-watering include yellowing leaves and root rot, while under-watering can cause leaf drop and wilting.
Light
Hawthorn thrives in full sun, requiring at least 6-8 hours of direct sunlight daily.
Ideal placement is in an open area where it can receive ample light, but it can tolerate partial shade, especially in hotter climates. It can handle some light shade but may not flower as profusely.
Soil
The ideal soil for Hawthorn is loamy, well-draining soil with a pH range of 6.0 to 7.5.
Good drainage is essential to prevent root rot, so consider using a potting mix that includes sand or perlite to enhance drainage.
Humidity
Hawthorn prefers moderate humidity levels, around 40-60%.
To increase humidity, mist the leaves or place a tray of water near the plant. Signs of humidity stress include browning leaf tips and increased susceptibility to pests.
Temperature
Hawthorn is hardy in USDA zones 5-8, thriving in temperatures between 60-75°F (15-24°C).
It can tolerate cold down to -20°F (-29°C) and is also heat-tolerant, making it suitable for various climates. In winter, protect young plants from extreme cold.
Fertilizing
Use a balanced fertilizer with an NPK ratio of 10-10-10, applying it in early spring and again in mid-summer.
Fertilize every 6-8 weeks during the growing season. Signs of nutrient deficiency include stunted growth and yellowing leaves, particularly if nitrogen is lacking.
Pruning
Prune Hawthorn in late winter or early spring before new growth begins.
Use sharp, clean pruning shears to remove dead or crossing branches and to shape the tree. Deadheading spent flowers can encourage more blooms. Avoid heavy pruning to maintain the tree's natural shape.
Repotting
Repot Hawthorn every 2-3 years or when the roots become pot-bound.
Signs it needs repotting include roots growing out of the drainage holes and stunted growth. Choose a pot 1-2 inches larger in diameter, and gently loosen the roots before placing it in fresh potting mix.
Propagation
Hawthorn can be propagated through seeds, stem cuttings, or layering.
For seeds, collect them in the fall, stratify for 30 days in a cold environment, then plant in spring. For stem cuttings, take 4-6 inch cuttings in late spring, dip in rooting hormone, and plant in a moist potting mix. Layering can be done by bending a low branch to the ground and covering part of it with soil.
When it's unhappy
Leaf spot
Why it happens
Fungal infections due to excessive moisture and poor air circulation.
How to fix it
Improve air circulation around the plant, avoid overhead watering, and apply a fungicide if necessary.
Powdery mildew
Why it happens
High humidity and poor air circulation.
How to fix it
Ensure good airflow, avoid watering the leaves, and apply a fungicide if the problem persists.
Aphids
Why it happens
Pests attracted to new growth and sap.
How to fix it
Use insecticidal soap or neem oil to control aphid populations and encourage beneficial insects.
Root rot
Why it happens
Over-watering or poorly draining soil.
How to fix it
Allow the soil to dry out between waterings and ensure proper drainage. If root rot is severe, consider repotting the plant.
Browning leaf tips
Why it happens
Low humidity or under-watering.
How to fix it
Increase humidity levels and adjust watering frequency to keep the soil consistently moist but not soggy.
Care through the year
Spring
In spring, focus on fertilizing and pruning your Hawthorn to encourage new growth. Monitor for pests and diseases as the weather warms.
Summer
During summer, ensure consistent watering, especially during dry spells. Mulch around the base to retain moisture and suppress weeds.
Fall
In fall, prepare your Hawthorn for winter by reducing watering and applying mulch to protect the roots. Monitor for any signs of disease.
Winter
In winter, protect young Hawthorn trees from extreme cold by wrapping the trunk or covering the base with mulch. Water sparingly, as the plant is dormant.
Toxicity & Safety
Hawthorn is generally considered non-toxic to pets and children. However, the seeds contain small amounts of cyanogenic compounds, which can be harmful if ingested in large quantities. Symptoms of ingestion may include nausea and vomiting.
Good to know
Why are my Hawthorn leaves turning yellow?
Yellowing leaves on a Hawthorn can indicate over-watering or nutrient deficiency. Check the soil moisture and consider fertilizing if the plant has not been fed recently.
How often should I water my Hawthorn?
Water your Hawthorn every 1-2 weeks during the growing season, allowing the top inch of soil to dry out between waterings. Adjust frequency based on rainfall and temperature.
What is the best fertilizer for Hawthorn?
A balanced fertilizer with an NPK ratio of 10-10-10 is ideal for Hawthorn. Apply it in early spring and mid-summer for optimal growth.
When should I prune my Hawthorn?
Prune your Hawthorn in late winter or early spring before new growth begins. This helps maintain its shape and encourages healthy growth.
Can I grow Hawthorn in a pot?
Yes, Hawthorn can be grown in a pot, but ensure it has good drainage. Repot every 2-3 years to provide fresh soil and space for growth.
What pests affect Hawthorn trees?
Common pests include aphids, spider mites, and scale insects. Monitor your plant regularly and treat infestations promptly with insecticidal soap or neem oil.
How can I propagate my Hawthorn?
Hawthorn can be propagated through seeds, stem cuttings, or layering. Seeds require stratification, while cuttings should be taken in late spring and treated with rooting hormone.
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