Phlomis purpurea — an easy houseplant, prefers full sun light
SPECIMEN · FROM THE LIBRARY
Phlomis purpurea

Phlomis Purpurea

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Phlomis purpurea, commonly known as purple Jerusalem sage, is a perennial herbaceous plant in the Lamiaceae family. Native to the Mediterranean region, it can be found in countries such as Greece, Turkey, and Syria. The plant grows up to 1 meter in height, featuring a woody stem and green leaves covered with fine hairs. Its purple-pink flowers bloom from late spring through summer.

This plant prefers well-drained soil and full sun exposure, though it can also tolerate partial shade. Once established, Phlomis purpurea is drought-tolerant but requires regular watering during its initial growth period.

Phlomis purpurea has been used medicinally for centuries, primarily for its anti-inflammatory properties. Its leaves have been applied as a poultice for treating wounds, while its roots have been used to address respiratory ailments such as coughs.

Beyond its medicinal uses, Phlomis purpurea is also grown ornamentally for its attractive flowers, which attract bees and butterflies to gardens. Its drought-tolerant nature makes it an ideal choice for xeriscaping or landscapes with low water availability.

In summary, Phlomis purpurea is an aesthetically pleasing herbaceous perennial that offers both ornamental value and medicinal benefits, making it a popular choice among gardeners worldwide.

A note from PlantMom

Purple jerusalem sage is fairly disease-resistant and is usually not susceptible to illnesses. Care-wise, this plant is relatively low-maintenance. When grown outdoors it needs little watering, and larger plants typically do not require pruning. Smaller plants, however, should be pruned after they have finished blooming. Purple jerusalem saget is appropriate for anyone with an outdoor area, such as a garden or deck, and does not demand much care experience.

— PlantMom
CARE GUIDE

How to keep Phlomis Purpurea.

Light

Purple Jerusalem sage performs best with full, unobstructed sun, which promotes optimal growth. Its native habitat is open and clear, so it is well adapted to those conditions. Plenty of sunlight is beneficial at every stage of growth. Too little light can slow its development, while too much can scorch the leaves.

Water

Purple Jerusalem sage thrives in the dry conditions typical of its Mediterranean origin, needing watering only every 2-3 weeks. It prefers well-draining soil and benefits from dry conditions to prevent root rot. As an evergreen, it’s important to monitor soil moisture throughout the year, especially in dry indoor environments.

Temperature

Purple jerusalem sage adapts well to heat and can handle higher temperatures and wider temperature swings. In hot weather, you should watch watering and provide appropriate shade to prevent sunburn. However, Purple jerusalem sage does not tolerate low temperatures well. Although it can endure some cold, very low temperatures may cause frost damage.

Fertilizer

Proper timing is important when fertilizing Purple Jerusalem sage. Apply fertilizer in early spring and continue once a month until early summer. Fertilizer encourages attractive blooms and supplies energy during both dormant and active growth periods.

Pruning

Purple Jerusalem sage, known for its fragrant, woolly leaves and vibrant purple flowers, requires some care for optimal growth. In early spring, prune the plant by one-third to promote bushier growth and more abundant blooms. Be sure to remove any dead stems to maintain the plant's health, using sharp and clean tools to prevent the spread of disease.

CHARACTERISTICS

Botanical profile.

Plant Type
Shrub
Life Cycle
Perennial
Genus
Phlomis
Family
Lamiaceae
Hardiness Zone
8-11
Mature Height
1.22 m to 1.83 m
Mature Spread
0.61 m to 1.22 m
Leaf Color
Green, Gray
Leaf Type
Evergreen
Flower Color
Pink, Purple, White
Flower Size
2.03 cm to 3.05 cm
Bloom Time
Mid spring, Late spring, Early summer
Planting Time
Spring, Summer, Autumn
Harvest Time
Mid summer, Late summer, Early fall
ALSO KNOWN AS

Other names.

en Purple Jerusalem sage en Pink Phlomis
FREQUENTLY ASKED

Reader questions.

How should I water my Purple jerusalem sage?

Your Purple Jerusalem sage is not very particular about how you water it. You can use most common watering tools, like watering cans, hoses, or even cups. It's important to water it by directly applying the water to the soil. Make sure to evenly moisten all areas of the soil to provide water to the entire root system. Using filtered water is a good idea, as tap water may contain harmful particles. It's also beneficial to use water that is at or slightly above room temperature to avoid shocking the plant. However, the Purple Jerusalem sage can generally tolerate different types of water well.

Why should I put fertilizer on my Purple Jerusalem Sage plant?

To ensure beautiful blooms, it's important to fertilize your Purple Jerusalem Sage. Fertilizing in early spring is particularly effective in promoting excellent flowers during that season. Additionally, fertilizer provides the plant with energy that it stores in the ground during its dormant phases. By giving your Purple Jerusalem Sage extra nutrients during fall planting or late spring, it will have more energy to utilize when active growth resumes.

What are the sunlight requirements for Purple Jerusalem Sage?

Purple Jerusalem Sage thrives in full sun, requiring more than 6 hours of sunlight daily. It's crucial to observe the sunlight's path in your garden to ensure your plants receive the right balance of light and shade for optimal growth. Originating from clear-skied habitats, this plant is well-adapted to plentiful sunlight at each growth stage. Insufficient light can slow down its growth, while excessive sunlight may lead to leaf scorch. An intriguing aspect to note is the plant's sensitivity to the sun's intensity, which can be mitigated by gradually introducing it to sunnier spots or utilizing artificial lighting when natural sunlight is insufficient.

What should I do if I give my Purple jerusalem sage too much or too little water?

When it comes to outdoor plants, especially newly planted ones or seedlings, they are prone to not getting enough water. It is important to ensure sufficient watering for the first few months while the tree is small or recently planted. This is because once the roots are established, Purple jerusalem sage can rely on rain most of the time. In the case of Purple jerusalem sage planted in pots, overwatering is often more likely to occur. If you accidentally overwater your Purple jerusalem sage, you should take immediate action to address the situation. First, stop watering the plant right away to minimize the impact of overwatering. Then, consider removing the plant from its pot to inspect the roots. If no root rot is found, it should be fine to return the plant to its container. However, if root rot is present, trim away the affected roots and consider applying a fungicide to prevent further damage. Finally, repot the Purple jerusalem sage in well-draining soil. On the other hand, underwatering is a relatively easy issue to fix. If you notice the plant's leaves drooping, drying out, or falling off, simply water the plant more frequently. The leaves will quickly regain their fullness after receiving sufficient water. Make sure to adjust your watering frequency as soon as you notice signs of underwatering.

When should I fertilize my Purple jerusalem sage for the best results?

To effectively fertilize Purple Jerusalem sage, timing is crucial. Applying fertilizer too early, while the plant is dormant, is ineffective as it will be washed away by rainwater, causing waste and pollution. The first application of fertilizer should be in early spring, followed by monthly applications until early summer.

How can artificial lighting benefit indoor Purple Jerusalem Sage plants?

Artificial lighting is a valuable solution for indoor Purple Jerusalem Sage plants, especially in conditions where natural sunlight is limited, such as during winter or in less sunny spaces. Optimal growth can be achieved by providing adequate lighting, with LED lights being a popular and effective choice due to their ability to mimic specific wavelengths needed by plants. Full sun plants require 30-50W per square foot, partial sun plants need 20-30W per square foot, and full shade plants need 10-20W per square foot of artificial light. The appropriate distance for the light source is 12-36 inches above the plant, and most plants benefit from 8-12 hours of light per day to mimic natural daylight hours.

How frequently should I water my Purple jerusalem sage?

For most outdoor plants, rainfall is enough to sustain normal growth. However, in areas with low rainfall, it's important to water your plants adequately. During the spring and fall, watering every 2 weeks should suffice. In the summer, more frequent watering is needed, while in the winter, less water is necessary due to slower growth. In fact, during winter, additional watering may not be needed at all. If your Purple Jerusalem sage is young or newly planted, more frequent watering is recommended to help it establish and grow into a more adaptable and drought-tolerant plant. When it comes to potted plants, there are two main approaches to determining watering frequency for Purple Jerusalem sage. One option is to follow a predetermined watering schedule of once every week or once every other week. However, this may not always be effective as it fails to consider the specific growing conditions of your plant. Another option is to gauge watering based on soil moisture. It's generally a good idea to wait until the top two to four inches of soil (about one-third to one-half the depth of the pot) has completely dried out before watering again. This method allows you to adjust watering frequency according to the plant's needs, which can change with the seasons. During summer, when water needs are highest, the predetermined schedule may not be sufficient.

When should I not fertilize my Purple Jerusalem sage?

To ensure optimal growth and blooming of Purple Jerusalem Sage, it is important to be mindful of the nitrogen content in the fertilizer. Excessive nitrogen can result in an abundance of leaves but limited blooms. Therefore, it is advisable to select a fertilizer with a lower nitrogen level compared to other nutrients. Furthermore, it is recommended to refrain from fertilizing Purple Jerusalem Sage after early autumn. Fertilizing during this time can lead to excessive growth right before winter, which is not desirable. Moreover, avoid fertilizing the plant during hot and dry periods as dry soil is less effective at delivering the fertilizer to the roots. Additionally, fertilizing during such times can stimulate growth, requiring more water that may not be readily available. It is best to apply fertilizer during cooler temperatures earlier in the season. Lastly, it is crucial to be cautious of inadvertently providing Purple Jerusalem Sage with a double-dose of fertilizer. The plant has the ability to absorb fertilizer applied to nearby plants or lawns. Therefore, it is important to be mindful and avoid over-fertilizing the shrub/tree.

What are symptoms of insufficient or excessive sunlight in Purple Jerusalem Sage?

Purple Jerusalem Sage may exhibit several symptoms due to insufficient or excessive sunlight exposure. Symptoms of inadequate sunlight include smaller new leaves, leggy or sparse growth, faster leaf drop, slower or halted growth, and lighter-colored or irregularly patterned new leaves. On the other hand, excessive sunlight can lead to chlorosis, where leaves lose their green color and turn yellow; sunscald, causing damaged plant tissue; leaf curling, as a defense mechanism to reduce water loss; wilting, from increased transpiration; and leaf scorching, characterized by brown, dry edges on leaves. These symptoms highlight the plant's sensitivity to the sun's intensity.

How much water does my Purple jerusalem sage require?

To properly water your Purple jerusalem sage, remember that it doesn't always require a lot of water. If only a few inches of soil have dried since the last watering, give it about five to ten ounces of water. You can also judge how much water to give based on the dryness of the soil. If more than half of the soil has dried out, give it more water until excess water drains from the pot. If your Purple jerusalem sage is planted in a rainy area, it may not need additional watering. When it's young, make sure it gets 1-2 inches of rain per week. As it grows, it can survive solely on rainwater, but during hot weather with no rainfall for 2-3 weeks, give it a full watering to prevent stress.

Which fertilizer should I use for my Purple jerusalem sage?

To promote healthy growth and blooming in Purple Jerusalem Sage, it is recommended to use a fertilizer that contains a balanced mix of the three main plant nutrients, with slightly more phosphorus. Alternatively, you can enhance the soil by adding organic materials like compost, worm castings, or manure. Experienced gardeners may choose to supplement with water-soluble fertilizers containing phosphorus when the flower buds start to appear. This helps the flowers develop better and allows for larger and longer-lasting blooms. There are different types of fertilizers available, most of which are suitable for Purple Jerusalem Sage. However, the best options are usually in liquid or powdered form. Regardless of which type you choose, make sure to dilute it and apply while watering the plant.

What solutions can be applied to address sunlight-related issues for Purple Jerusalem Sage?

To ensure your Purple Jerusalem Sage receives optimal sunlight, gradually acclimatize it to sunnier locations by moving it to a brighter spot each week, aiming for at least 6 hours of direct sunlight daily. For indoor plants, consider using a south-facing window or artificial lighting, such as a desk lamp or professional grow lights, for at least 8 hours a day. Outdoors, avoid drastic changes in lighting to prevent sunburn. If sunlight is blocked by obstructions like trees, consider pruning or transplanting the plant to a sunnier location during its dormant period for improved growth. Note that parts of the plant that have suffered from light deficiency may not recover, but new growth will be healthy following these adjustments.

PLATES
Phlomis purpurea leaf
PLATE 01 · leaf
Phlomis purpurea leaf
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Phlomis purpurea flower
PLATE 03 · flower
Phlomis purpurea flower
PLATE 04 · flower
Phlomis purpurea fruit
PLATE 05 · fruit
Phlomis purpurea fruit
PLATE 06 · fruit
ALSO IN THE LIBRARY

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