California tree poppy (Romneya coulteri)

Also known as: Matilija poppy, Canyon poppy dream of the desert

Romneya coulteri, commonly known as the Matilija poppy, is a perennial shrub that draws bees and butterflies with its large, white flowers. This plant is low-maintenance and enters dormancy during the summer months. It thrives in dry, well-drained environments, including rocky and sandy soils.

In This Article

Care Tips Water Sunlight Temperature Soil Fertilize Prune Propagation Repotting Toxicity

Attributes of California tree poppy

Lifespan

Perennial, Annual

Plant Type

Herb

Plant Height

2.5 m

Spread

1.5 m

Leaf Color

Green Gray Silver

Flower Size

10 cm to 23 cm

Flower Color

White Yellow

Images of California tree poppy

Quickly Identify California tree poppy

Statuesque growth reaching 4-6 feet (1.2-1.8 meters) tall.

Distinctive glaucus gray foliage with pinnately divided, 3-5 lobed leaves.

Large flowers, about seven inches (18 centimeters) wide, with white crinkled petals and yellow center.

Abundant blooms emit a delicate fragrance in spring and summer seasons.

Thrives in well-drained soils, exhibiting drought tolerance and preferring full to partial sun exposure.

Scientific Classification of California tree poppy

Phylum

Vascular plants

Class

Dicotyledons

Order

Ranunculales

Family

Poppy

Genus

Matilija poppies

Species

California tree poppy

Planting and Growing of California tree poppy

Care Difficulty

Hard

Watering Schedule

Every 2 days

Sunlight Requirements

Full sun

Sunshine Duration

6-10 hours

Ideal Temperature

60-75℉

Soil Type

Potting Mix, Peat Mix

Soil pH

6.5-7.5

Fertilizer Type

Balanced

Pruning Season

Spring, Summer

Pruning Area

Branches, Leaves

Pruning Frequency

2 times a year

Repotting Season

Spring

Pot Type

Plastic, Ceramic

How to Water California tree poppy?

For Romneya coulteri, water the plant until the soil is thoroughly moist but not waterlogged. The ideal watering volume is about 500 milliliters per session, ensuring it reaches deep into the soil to encourage the plant's deep root growth.

What are the symptoms of an underwatered California tree poppy? ›

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What are the symptoms of an overwatered California tree poppy? ›

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What Are the Sunlight Requirements for California tree poppy?

Sunlight Requirements: Full sun

Duration of light: 6-8 hours daily

Romneya coulteri thrives best under full sun, benefiting from 6-8 hours of sunlight daily. Ideal light promotes vibrant blooms and strong growth, making it a showy and healthy addition to sunny gardens.

How much sunlight does Romneya coulteri need? ›

What happens if Romneya coulteri doesn't get enough sunlight? ›

What are the best solutions to provide ideal sunlight? ›

More About Sunlight Requirements Techniques→

What Is the Ideal Temperature Range for California tree poppy?

Ideal Temperature: 60 ~ 75℉

Romneya coulteri thrives best within a temperature range of 60 to 75 degrees Fahrenheit. This range ensures optimal growth and flowering, providing conditions similar to its native Californian habitats. Maintaining these temperatures in cultivation will promote lush foliage and vibrant blooms, making sure temperature dips or spikes do not stress the plant.

What Soil is Best for California tree poppy?

Soil type: Sandy soil, Loam, Sandy loam

Soil PH: 6.5 ~ 7.5

Romneya coulteri thrives in well-drained soil, which prevents root rot and ensures that the plant gets the right amount of moisture. Good drainage is imperative, as it mimics its natural habitat, enhancing root health and overall vigor. While not overly demanding, this plant appreciates a touch of organic matter in the soil to provide essential nutrients. A nutrient-rich medium allows for robust growth and vibrant blooms, fulfilling its ornamental potential. Aerated soil ensures oxygen reaches the plant roots, promoting healthy respiration. Soil structure that allows air circulation supports root development and nutrient uptake, thus fostering a healthy, flourishing plant.

How to Fertilize California tree poppy?

Fertilizer type: Balanced

Romneya coulteri benefits from a balanced fertilizer application. Aim for a general-purpose liquid fertilizer diluted to half strength. For solid fertilizers, use a slow-release type; about 1 pound per plant per year is sufficient and will help it flourish.

How to Prune California tree poppy?

Pruning Time: Spring, Summer, Autumn

Begin by identifying any dead or damaged stems. These are often brown and brittle. Removing them allows the plant to direct energy to healthy growth and maintain its vibrant appearance. Cut back the plant by up to one-third or to a height of 18 inches. This encourages lush, new growth and helps maintain the plant's structure. Be cautious to not cut too deeply into older stems. More About Pruning Techniques→

How to Propagate California tree poppy plant?

Propagate Time: Early spring, Late spring, Early summer

Fill seed trays with a well-draining seed-starting mix and evenly distribute the seeds over the surface. Lightly cover them with more mix and mist with water to ensure even moisture. Place trays in a bright, warm area to promote germination.

Select a healthy and non-flowering stem from the Romneya coulteri plant. Using sharp pruning shears, cut around 4-6 inches. Remove the lower leaves and dip the cut end into rooting hormone to encourage faster root development.

Insert the cutting into a pot filled with a mixture of peat and perlite. Firmly press the soil around the base of the stem. Water thoroughly and cover with a plastic dome or bag to maintain humidity until roots develop.

More About Propagating Techniques→

How to Repot California tree poppy plant?

Repotting frequency: Every 2-3 years

Romneya coulteri signals its need for repotting when its roots begin to circle the interior of the pot or grow out from drainage holes. Another indicator is if the plant's growth seems stunted or it is producing fewer blooms. Spring and summer offer the ideal conditions for repotting as the plant is actively growing and can recover more quickly.

Choose a pot that is one size larger and has excellent drainage properties. Clay pots are ideal as they allow moisture to evaporate more readily, preventing root rot. Ensure the pot depth accommodates the root system while offering room for future growth, which aids in robust floral and foliage development.

Opt for a well-draining sandy soil mix that mimics its natural habitat. This type of soil ensures that water does not accumulate around the roots, reducing the risk of rot. The sandy texture allows roots to explore and extract the necessary nutrients efficiently, promoting a healthy and vibrant plant.

Toxicity of California tree poppy

Is California tree poppy toxic to humans?

The risk of poisoning from the California tree poppy primarily arises from inadvertent contact with the plant. Its leaves contain saponin compounds that can lead to mild skin irritation, including symptoms such as redness, discomfort, and itching after physical contact. Ingesting the leaves may also result in slight gastrointestinal distress, presenting as nausea and stomach discomfort. This toxic species is commonly found as a cultivated plant in gardens or in arid regions of southern California and northern Mexico. Due to its attractive flowers and potential proximity to residential areas, children are particularly vulnerable to unintentional poisoning. Gardeners should remember to wear gloves to protect themselves when handling the California tree poppy.

WARNING

The judgment on toxicity and danger is for reference only. We DO NOT GUARANTEE any accuracy of such judgment. Therefore, you SHALL NOT rely on such judgment. It is IMPORTANT TO SEEK PROFESSIONAL ADVICE in advance when necessary.

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