Phlomoides tuberosa — a medium houseplant, prefers full sun light
SPECIMEN · FROM THE LIBRARY
Phlomoides tuberosa

Phlomoides Tuberosa

Updated · 346 observations
ON THIS PLANT

Phlomoides tuberosa (syn. Phlomis tuberosa), the sage-leaf mullein, is a perennial herbaceous flowering plant in the family Lamiaceae, native to China, Kazakhstan, Kyrgyzstan, Mongolia, Russia; SW Asia and Europe. Enlarged, tuberous roots give rise to erect stems to 150 cm bearing purple-red flowers.

A note from PlantMom

Tuberous Jerusalem sage is fairly resistant to disease and generally not prone to illnesses. However, it can be vulnerable to pests and diseases present in its environment. These issues are usually mild. In terms of care, the plant requires moderate maintenance. It should be pruned regularly to maintain a neat appearance and healthy growth. Fertilizing can also help encourage flowering. Tuberous Jerusalem sage is suitable for anyone with outdoor space, such as a garden or patio, and does not require extensive experience in plant care. It may need more attention when grown indoors.

— PlantMom
CARE GUIDE

How to keep Phlomoides Tuberosa.

Light

Tuberous Jerusalem sage generally does best with plentiful sunlight. Native to areas characterized by strong light, it can grow vigorously and reach optimal condition. However, too much exposure to very intense light may be harmful. Conversely, a shortage of sunlight can also impede its healthy growth and development.

Water

Tuberous Jerusalem sage thrives best with moderate moisture and should be watered once a week. While it can tolerate short periods of dryness, it prefers consistent hydration. Usually grown outdoors, this plant benefits from natural rainfall, which supports its vigorous growth during the active growing season.

Temperature

Tuberous Jerusalem sage is native to temperate regions and does best at temperatures between 41 to 95 °F (5 to 35 ℃). Because of its resilience, in winter consider relocating it indoors to a cooler area if temperatures fall below this.

Fertilizer

The best time to fertilize a Tuberous jerusalem sage is in early spring, when it is coming out of dormancy and beginning active growth. Fertilizing supplies essential nutrients for healthy development. Although Tuberous jerusalem sage has relatively low fertilizer requirements, giving it fertilizer annually can improve its survival and encourage better, longer-lasting flowers.

Pruning

Tuberous Jerusalem sage is a hardy perennial known for its tuberous roots and vibrant flowers. To care for this plant, prune it from early to late spring by removing dead stems and trimming after it flowers. This helps stimulate growth and maintain its shape. Regular pruning encourages vigorous blooms and prevents overcrowding, which improves the plant's overall health and appearance.

CHARACTERISTICS

Botanical profile.

Plant Type
Herb
Life Cycle
Perennial
Genus
Phlomoides
Family
Lamiaceae
Hardiness Zone
4-10
Mature Height
0.61 m to 1.22 m
Mature Spread
49 cm
Leaf Color
Green
Leaf Type
Deciduous
Flower Color
Pink
Flower Size
2.54 cm
Bloom Time
Early summer, Mid summer
Planting Time
Spring, Autumn
Harvest Time
Late summer, Early fall
Native Area
Turkey, Austria, Czech Republic, Slovakia, Bulgaria, Armenia, Greece, Croatia, Ukraine, China, Russia, Serbia, Hungary, Germany, Kyrgyzstan, Kazakhstan, Mongolia, Iran, Albania, Azerbaijan, Romania
ALSO KNOWN AS

Other names.

en Tuberous Jerusalem sage
FREQUENTLY ASKED

Reader questions.

How should I water my Tuberous jerusalem sage plant?

Here are some tips to ensure the health of your Tuberous Jerusalem Sage when watering it: 1. Use filtered water: Tap water may contain harmful particles, so filtered water is a better choice. 2. Use room temperature water: The Tuberous Jerusalem Sage comes from a warm environment, so using cold water can be a shock to its system. Aim for water at room temperature or slightly warmer. 3. Avoid overhead watering: This can cause foliage complications. Instead, apply the filtered room temperature water directly to the soil. 4. Soak the soil: Apply water until the soil is entirely soaked. This is beneficial because it moistens the roots and helps them spread through the soil, collecting necessary nutrients.

Why should I put fertilizer on my Tuberous jerusalem sage?

Fertilization is important for the Tuberous Jerusalem Sage because it provides essential nutrients for overall plant growth. While the fertilization needs of the plant are relatively low, annual fertilization can greatly benefit the plant. It helps keep the plant alive and promotes the production of better flowers that last longer. Therefore, those who want their Tuberous Jerusalem Sage to thrive should remember to fertilize it every year.

What are the sunlight requirements for Tuberous Jerusalem Sage?

Tuberous Jerusalem Sage thrives in full sunlight, needing more than 6 hours of sunlight daily. It's crucial to observe how sunlight moves through your garden to find spots that offer a perfect balance of light and shade, ensuring the plants receive the ideal conditions for growth. Originating from environments abundant in sunlight, this plant can exhibit robust and optimal growth when exposed to generous sunlight. However, excessive exposure to intense light or insufficient sunlight can negatively impact its health and development.

What is the ideal temperature range for Tuberous Jerusalem Sage?

Tuberous Jerusalem Sage thrives in temperate environments, with an ideal temperature range between 41°F to 95°F (5°C to 35°C). It is resilient to cold weather; however, it's advisable to move it to a cooler indoor area during winter if temperatures are expected to fall below its cold tolerance levels. Despite its strong cold resistance, extra frost protection measures might be necessary if winter temperatures are expected to drop below -30°C.

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

Both overwatering and underwatering can harm your Tuberous jerusalem sage, but overwatering is more commonly problematic. Excess water causes wilting and yellowing of the stems and leaves. It can also lead to diseases like root rot, mold, and mildew, which can be fatal for the plant. Although underwatering is less likely, it can still occur. In this case, the leaves may become brittle and brown. It's crucial to identify signs of overwatering early on to prevent irreversible damage. Reduce watering immediately if you notice such signs, and check the soil's drainage. If it's poor, replace it with a loose, well-draining potting mix. Conversely, if you suspect underwatering, simply water more regularly until the symptoms improve.

When should I fertilize my Tuberous jerusalem sage plant for best results?

The best time to fertilize a Tuberous jerusalem sage is in late winter to early spring when it is coming out of dormancy and starting to grow. Fertilizing during this time promotes healthy growth and sets it up for a successful season. Fertilizing in early spring is most beneficial, but fertilizing in the fall is also allowed. However, it is not recommended to fertilize during summer or winter.

Can artificial lighting be used for Tuberous Jerusalem Sage, and how?

Yes, artificial lighting can be a vital solution for Tuberous Jerusalem Sage, especially when natural sunlight is insufficient. LED lights are recommended due to their ability to provide specific wavelengths needed by the plants. For full sun plants, 30-50W/sq ft of artificial light is needed; partial sun plants require 20-30W/sq ft, and full shade plants need 10-20W/sq ft of light. The light source should be placed 12-36 inches above the plant, mimicking natural sunlight conditions. Most plants will need 8-12 hours of light per day to ensure optimal growth.

What are the important symptoms to look for in Tuberous Jerusalem Sage during temperature fluctuations?

During low temperatures, especially under -30°C, Tuberous Jerusalem Sage might show no noticeable changes in winter but could experience a decrease in sprouting or fail to sprout in spring. In contrast, high temperatures above 35°C, particularly exceeding 41°C, can cause the leaves to lighten, curl, suffer from sunburn, and the plant might wilt and dry out. It is vital to monitor these symptoms to maintain the plant's health.

How often do I need to water my Tuberous jerusalem sage?

If your Tuberous Jerusalem Sage is in a pot, you can determine if it needs water by sticking your finger in the soil. If the top two to three inches are dry, it's time to water it. The same method can be used if you have planted it in the ground outdoors. Once the first few inches of soil have dried out, it's time to add water. Typically, during the spring and early fall, watering once a week will be sufficient. However, in extremely hot weather, you may need to water it twice or more per week. Keep in mind that mature and well-established Tuberous Jerusalem Sage can endure dry conditions quite well.

When is the best time to not fertilize my Tuberous jerusalem sage?

To ensure proper fertilization of your Tuberous Jerusalem Sage, it is best to avoid fertilizing it during most of the year. The plant only requires one feeding annually, preferably in late winter or early spring. Fertilizing during spring, summer, and fall can lead to overfertilization and its associated issues. However, if you missed fertilizing in spring, it is acceptable to fertilize in the fall. During the winter, when the Tuberous Jerusalem Sage is in its dormant phase and not growing new foliage, fertilization is unnecessary and not recommended.

What are the common symptoms of inadequate lighting for Tuberous Jerusalem Sage?

Common symptoms of inadequate lighting include smaller new leaves, leggy or sparse growth, faster leaf drop, slower or no new growth, lighter-colored new leaves, chlorosis, sunscald, leaf curling, wilting, and leaf scorching. These symptoms can indicate that the plant is not receiving the right amount of sunlight, which is essential for its health and development.

How should you care for Tuberous Jerusalem Sage during winter?

For Tuberous Jerusalem Sage, if winter temperatures are expected to fall below -30°C, it's essential to provide cold protection by covering the plant with soil or straw. Before the onset of the first freeze in autumn, water the plant abundantly to ensure the soil remains moist and enters a frozen state, which helps prevent drought and water scarcity during winter and early spring.

PLATES
Phlomoides tuberosa leaf
PLATE 01 · leaf
Phlomoides tuberosa leaf
PLATE 02 · leaf
Phlomoides tuberosa flower
PLATE 03 · flower
Phlomoides tuberosa flower
PLATE 04 · flower
Phlomoides tuberosa fruit
PLATE 05 · fruit
ALSO IN THE LIBRARY

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