Guava
Psidium Guajava
The guava, or Psidium guajava, is a tropical fruit tree known for its sweet, aromatic fruit and lush foliage. Originating from Central America, it is cherished for its delicious flavor and health benefits, making it a popular choice among home gardeners.
Everything it needs
9 essentials at a glance
Watering
Water guava trees deeply but infrequently, allowing the top 2-3 inches of soil to dry out between waterings.
In the growing season (spring and summer), water every 1-2 weeks, while in fall and winter, reduce to every 3-4 weeks. Signs of over-watering include yellowing leaves and root rot, while under-watering may cause leaf drop and wilting.
Light
Guava trees thrive in full sun, requiring at least 6-8 hours of direct sunlight daily.
Ideal placement is in a south-facing garden or patio. While they can tolerate partial shade, reduced light can lead to poor fruit production.
Soil
Guava prefers well-draining soil with a pH range of 5.5 to 7.0.
A sandy loam or a potting mix designed for fruit trees is recommended. Ensure good drainage to prevent root rot, and consider adding organic matter to improve soil structure.
Humidity
Guava trees prefer moderate humidity levels, ideally between 50-70%.
To increase humidity, mist the leaves or place a humidifier nearby. Signs of low humidity include leaf browning and curling, while excessive humidity can lead to fungal diseases.
Temperature
Ideal temperature range for guava is 70-90°F (21-32°C).
They are hardy in zones 9-11, with some varieties tolerating temperatures down to 30°F (-1°C) for short periods. Protect from frost and extreme heat by providing shade during the hottest part of the day.
Fertilizing
Use a balanced fertilizer with an NPK ratio of 10-10-10 or 8-3-9, applying every 6-8 weeks during the growing season.
In fall and winter, reduce fertilization. Signs of nutrient deficiency include yellowing leaves (nitrogen), poor fruit set (phosphorus), and leaf drop (potassium).
Pruning
Prune guava trees in late winter or early spring to shape and remove dead or crossing branches.
Use sharp, clean pruning shears to make clean cuts. Regular pruning encourages better air circulation and fruit production. Deadheading is not necessary.
Repotting
Repot guava trees every 2-3 years or when roots outgrow the pot.
Signs include roots growing out of the drainage holes or stunted growth. Choose a pot 1-2 inches larger in diameter, and gently loosen the roots before placing in fresh potting mix.
Propagation
Guava can be propagated through seeds, stem cuttings, or air layering.
For seeds, soak them for 24 hours before planting in a seed-starting mix. For stem cuttings, take 6-8 inch cuttings from healthy plants in spring, dip in rooting hormone, and plant in a well-draining mix. Keep moist until roots develop, usually within 4-6 weeks.
When it's unhappy
Yellow leaves
Why it happens
Typically caused by over-watering or nutrient deficiency.
How to fix it
Check soil moisture and reduce watering frequency. Fertilize with a balanced fertilizer if nutrient deficiency is suspected.
Root rot
Why it happens
Over-watering or poorly draining soil.
How to fix it
Ensure proper drainage and reduce watering. If root rot is severe, consider repotting with fresh soil.
Leaf drop
Why it happens
Can occur due to stress from temperature changes or under-watering.
How to fix it
Maintain consistent watering and protect from extreme temperatures.
Fungal diseases
Why it happens
High humidity and poor air circulation can lead to fungal infections.
How to fix it
Improve air circulation by pruning and avoid overhead watering. Use fungicides if necessary.
Pest infestations (e.g., aphids, spider mites)
Why it happens
Common in stressed plants or those with low humidity.
How to fix it
Inspect regularly, and treat with insecticidal soap or neem oil if pests are found.
Care through the year
Spring
In spring, focus on fertilizing and watering as the tree begins to grow. Prune any dead or crossing branches to encourage new growth.
Summer
During summer, ensure consistent watering and monitor for pests. This is also the time for fruit development, so maintain good humidity.
Fall
In fall, reduce watering as temperatures drop and prepare for winter. Harvest any remaining fruit before the first frost.
Winter
In winter, protect the tree from frost and cold temperatures. Water sparingly and avoid fertilizing until spring.
Toxicity & Safety
Guava is generally non-toxic to pets and children. However, ingestion of large quantities may cause mild gastrointestinal upset. The leaves and fruit are safe to consume.
Good to know
How often should I water my guava tree?
Water your guava tree every 1-2 weeks during the growing season, allowing the top 2-3 inches of soil to dry out between waterings.
Why are my guava leaves turning yellow?
Yellow leaves can indicate over-watering or a nutrient deficiency. Check the soil moisture and consider fertilizing if needed.
What type of soil is best for guava trees?
Guava trees prefer well-draining soil with a pH of 5.5 to 7.0. A sandy loam or a fruit tree potting mix works well.
When is the best time to prune guava trees?
The best time to prune guava trees is in late winter or early spring before new growth begins, which encourages better fruit production.
Can guava trees grow in pots?
Yes, guava trees can thrive in pots, but ensure the pot has good drainage and repot every 2-3 years as they grow.
What pests should I watch for on my guava tree?
Common pests include aphids and spider mites. Regularly inspect your plant and treat infestations promptly with insecticidal soap.
How long does it take for guava trees to bear fruit?
Guava trees typically start bearing fruit within 2-4 years after planting, depending on the variety and growing conditions.
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