Hieracium amplexicaule — a medium houseplant, prefers full sun light
SPECIMEN · FROM THE LIBRARY
Hieracium amplexicaule

Hieracium Amplexicaule

Updated · 201 observations
ON THIS PLANT

Hieracium amplexicaule (also called sticky hawkweed) is a species of plant from the family Asteraceae.

A note from PlantMom

Sticky hawkweed is fairly disease-resistant and is usually not prone to illnesses. However, it can be affected by pests and diseases present in its surroundings; these infections are generally not severe. For care, the plant needs moderate maintenance. It should be pruned regularly to preserve a good appearance and support healthy growth. Fertilizing can also help encourage flowering. Sticky hawkweed is suitable for anyone with an outdoor area, such as a garden or patio, and does not require much care experience. It may demand more attention when grown indoors.

— PlantMom
CARE GUIDE

How to keep Hieracium Amplexicaule.

Light

Sticky hawkweed is a sun-loving, perennial herbaceous plant that comes from open habitats and is commonly found in meadows and grasslands. It prefers full sun but can also tolerate partial sun.

Water

Sticky hawkweed thrives in environments with moderate moisture and can tolerate short periods of dryness. For optimal health, water the plant weekly, adjusting the frequency based on rainfall during the growing season.

Temperature

Sticky hawkweed can tolerate a wide range of temperatures, although its distribution can still be restricted by different combinations of moisture and heat. It does best in warm summer conditions with enough rainfall or watering. Long periods of cloudy, rainy weather, as well as extended high temperatures, can increase the risk of Sticky hawkweed dying. In winter, shielding it from the cold can boost the plant's chances of survival.

Fertilizer

Usually one application of fertilizer in spring is adequate for Sticky hawkweed, although multiple treatments can enhance growth. Feed about once every month to a month and a half. Fertilization improves leaf appearance and function, helping to maintain even color and a healthy texture. It also promotes root development and nutrient uptake for long-term plant health.

Pruning

Sticky hawkweed, recognized for its sticky leaves and vibrant yellow flowers, thrives best when pruned between early and late spring. To promote plant health and enhance air circulation, remove any damaged stems and thin out excess foliage. Be sure to use clean, sharp tools to reduce the risk of damage and disease.

CHARACTERISTICS

Botanical profile.

Plant Type
Herb
Life Cycle
Perennial
Genus
Hieracium
Family
Asteraceae
Hardiness Zone
4-8
Mature Height
30 cm to 61 cm
Mature Spread
20 cm to 40 cm
Leaf Color
Green, Light Green
Leaf Type
Deciduous
Flower Color
Yellow
Flower Size
2.03 cm to 3.05 cm
Bloom Time
Summer
Planting Time
Spring, Autumn
Harvest Time
Late summer, Early fall, Mid fall
ALSO KNOWN AS

Other names.

en Sticky Hawkweed
FREQUENTLY ASKED

Reader questions.

How should I water my Sticky hawkweed to make it thrive?

When watering the Sticky hawkweed, it is recommended to use filtered water at room temperature or slightly warmer. Tap water can contain harmful particles for this plant. Cold water should be avoided as it can be a shock to the Sticky hawkweed, which is used to a warm environment. Instead of overhead watering, it is best to apply filtered room temperature water directly to the soil until it is completely soaked. Soaking the soil is beneficial for this plant as it helps moisten the roots and aids in their spread through the soil to collect necessary nutrients.

What are the sunlight requirements for Sticky hawkweed?

Sticky hawkweed, or Hieracium amplexicaule, is a sun-loving perennial that thrives in full sun, requiring above 6 hours of sunlight a day, though it can also tolerate conditions of partial sun, about 3-6 hours of sunlight. To ensure your Sticky hawkweed's happiness, observe the movement of sunlight through your garden and choose planting spots that provide a balanced mix of light and shade.

What should I do if I give my Sticky hawkweed too much or too little water?

Overwatering is a common problem that can harm your Sticky hawkweed's health. It causes wilting and yellowing of the stems and leaves. Overwatering for a long time can lead to diseases like root rot, mold, and mildew, which are fatal for the plant. Underwatering is less common but can still happen. It makes the leaves brittle and brown. It's important to recognize the signs of overwatering early on for your Sticky hawkweed because some diseases can't be reversed if not addressed promptly. If you notice these signs, reduce your watering schedule and check the soil quality. If the soil doesn't drain well, replace it with a loose, well-draining mix. If your plant lacks water, increase your watering frequency until the signs disappear.

How can artificial lighting support Sticky hawkweed growth indoors?

When natural sunlight is inadequate, especially during winter or in less sunny spaces, artificial lighting becomes crucial for the growth of indoor Sticky hawkweed plants. For optimal growth, select the appropriate artificial light, such as LEDs, which can be tailored to provide specific light wavelengths. Full sun plants need 30-50W/sq ft, partial sun plants 20-30W/sq ft, and full shade plants 10-20W/sq ft of light. The light source should be placed 12-36 inches above the plant, mimicking natural sunlight's intensity and duration, with most plants benefiting from 8-12 hours of light per day.

How much should I water my Sticky hawkweed?

If your Sticky hawkweed plant is in a pot, the most accurate way to determine if it needs water is to feel the soil with your finger. If the top two to three inches of soil are dry, it's time to water it. Similarly, if you have the plant planted outdoors in the ground, you can use the same method to test the soil. Once the top few inches of soil have dried out, it's a sign to water the plant. Typically, you'll need to water it about once a week during the spring and early fall. However, during extremely hot weather, you may need to increase the frequency to twice a week or more. It's important to note that mature, well-established Sticky hawkweed plants have a good drought tolerance.

What are the signs of poor lighting for Sticky hawkweed?

Signs of inadequate lighting in Sticky hawkweed include smaller new leaves compared to mature ones, leggy or sparse growth, early leaf drop to conserve resources, delayed or halted new growth, pale or irregularly colored new leaves indicating insufficient chlorophyll, chlorosis where leaves lose their green hue, sunscald marked by pale or necrotic patches from intense sunlight, leaf curling as a defense against excessive sunlight, wilting due to loss of turgor pressure, and leaf scorching characterized by brown, dry edges on leaves.

How much water does my Sticky hawkweed require?

To properly water your Sticky hawkweed, don't be stingy with the amount of water you provide. Make sure the top two to three inches of soil are dry, then give it a nice, deep watering. You want to fully saturate the soil, so add enough water so that it drains out of the bottom of the pot. If you don't see water draining out, it means you haven't watered enough. Be careful not to let water accumulate in the soil, as that can harm the plant. If you're watering your plant outside, about 1 inch of rain per week should be enough. Avoid using poorly draining soils, as they can be harmful to the health of the plant.

How can I address Sticky hawkweed's light requirements indoors and outdoors?

To optimize Sticky hawkweed's light exposure indoors, gradually move your plant to sunnier spots to receive at least 6 hours of direct sunlight daily, utilizing south-facing windows for maximum exposure. Artificial lighting like desk or ceiling lamps, or professional plant grow lights, can supplement light for at least 8 hours a day. Outdoors, similarly, gradually acclimate your plant to sunnier locations each week to prevent sunburn. Reducing obstructions or transplanting during the dormant period can enhance light access for ground-planted specimens. Note that parts of the plant suffering from previous light deficiency may not recover, but new growth will be healthy with improved lighting.

How do I water my Sticky hawkweed when it's growing at different stages?

The water needs of the Sticky hawkweed can vary depending on its growth stages. In the first few years of its life, or when it has been recently transplanted, it requires more water than usual. During these stages, the plant focuses on developing new roots to support future growth, and these roots need slightly more moisture. As the plant matures, it will require less water. Additionally, during the bloom period, when the plant is producing flowers, it may need more water to support the development of these blooms.

How do I water my Sticky hawkweed all year round?

The Sticky hawkweed has different water needs based on the season. In the hottest months of the year, it will require the most water. During summer, you might need to water it more than once per week, depending on how quickly the soil dries out. However, in winter, the plant enters a dormant phase and needs much less water. In fact, you may not need to water it at all during winter. If you do decide to water it during this time, limit it to about once per month. Overwatering in winter increases the chance of disease for your Sticky hawkweed.

What's the difference between watering my Sticky hawkweed inside and outside?

Growing Sticky hawkweed indoors is most common for gardeners not living in temperate and tropical regions. However, it is important to note that soil in containers tends to dry out faster compared to ground soil. Additionally, drying elements like air conditioning units can increase the frequency of watering needed for Sticky hawkweed grown indoors compared to if it was planted outside. In outdoor conditions with regular rainfall, you may not need to water your Sticky hawkweed very often as the rainfall would suffice to keep it alive. On the other hand, for indoor growers, watering will be required more frequently since you cannot rely on rainwater to soak the soil.

PLATES
Hieracium amplexicaule leaf
PLATE 01 · leaf
Hieracium amplexicaule leaf
PLATE 02 · leaf
Hieracium amplexicaule flower
PLATE 03 · flower
Hieracium amplexicaule flower
PLATE 04 · flower
Hieracium amplexicaule fruit
PLATE 05 · fruit
Hieracium amplexicaule fruit
PLATE 06 · fruit
ALSO IN THE LIBRARY

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