Hemerocallis citrina
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Hemerocallis citrina

Citron day-lily Β· Long yellow day-lily Β· Citron daylily Β· Long yellow daylily

Tier 1 Difficulty: medium Water: moderate Light: full_sun Toxicity: high
Temperature
5–35 Β°C
Soil pH
6–7
Hardiness
Zone 3–10
Click count
51
Observations
37

Description

Source: leafsnap

Hemerocallis citrina, common names citron daylily and long yellow daylily, is a species of herbaceous perennial plant in the family Asphodelaceae.

🌳 If you're looking to plant a garden with night-blooming flowers, the citron daylily is an excellent choice. These flowers start to open around sunset and release a captivating fragrance. Typically, each bloom only lasts for a single night and wilts the following day, allowing a new flower to open on the same stalk.

🎭 Psychic abilities, Healing

Care Guide

πŸ’§ Water

The citron day-lily, native to East Asia, thrives in conditions with consistent moisture. Once established, it becomes moderately drought-tolerant. Ideally, it should be watered weekly; however, it adapts well outdoors, where it can benefit from natural rainfall. Its robust root system allows it to withstand dry spells, making it well-suited for temperate climates with fluctuating precipitation.

FAQ
What is the right way to water my Citron day-lily?

To keep your Citron day-lily healthy, it is best to water it with filtered water at room temperature. Tap water may have harmful particles, so filtering it is recommended. Since the Citron day-lily is accustomed to warm environments, it's important to avoid using cold water as it can be a shock to the plant. To prevent foliage issues, refrain from overhead watering. Instead, thoroughly soak the soil with your filtered room temperature water. This helps moisten the roots and promotes the spread of nutrients throughout the soil.

What do I need to do if I give my Citron day-lily too much or too little water?

Both overwatering and underwatering can harm the health of your Citron day-lily, but overwatering is more common. If the plant gets too much water, its stems and leaves may wilt and turn yellow. Overwatering for a long time can also lead to root rot, mold, and mildew, which can kill the plant. Underwatering is less likely because the Citron day-lily is fairly drought-tolerant. However, if it does happen, the leaves may become brittle and brown. It's important to watch for signs of overwatering and take action quickly. Some diseases caused by overwatering, like root rot, may not be fixable if you wait too long. If you see signs of overwatering, reduce your watering schedule and check the soil drainage. If the soil drains poorly, replace it with a loose, well-draining potting mix. If you see signs of underwatering, simply water the plant more regularly until the signs improve.

How frequently should I water my Citron day-lily?

If your Citron day-lily is in a pot, you can check 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 applies if you have the plant outdoors in the ground. Check the top few inches of soil and if it's dry, water it. In the spring and early fall, you'll likely need to water this plant once a week. During very hot weather, you might need to water it twice a week or more. However, it's worth noting that mature and well-established Citron day-lilies can handle dry conditions well.

How much water does my Citron day-lily require?

To effectively water your Citron day-lily, be generous with the amount of water you give. Make sure the top few inches of soil are dry before watering. It's best to thoroughly soak the soil, allowing water to flow through the drainage holes in the pot. If you don't see excess water draining, it means you haven't watered enough. However, be cautious not to let water accumulate in the soil, as this can harm the plant. Avoid using poorly draining soils, as they can also negatively impact the plant's health. If the plant is outdoors, providing 1 inch of rain per week should be sufficient.

How should I water my Citron day-lily as it grows?

The water needs of the Citron day-lily can vary depending on its growth stages. When in the first few years of its life or recently transplanted, it requires more water. During these stages, the plant focuses on developing new roots to support future growth, and these roots need extra moisture. As the plant matures, it requires less water. Additionally, during the bloom period, the Citron day-lily may need more water to support flower development.

β˜€οΈ Light Full sun

The citron day-lily performs best in full sun, which promotes healthy growth and development. It can tolerate moderate sunlight, though its growth will be slower. Originating from sun-rich habitats, it may experience suboptimal growth and reduced flowering if light is insufficient, while excessive light can lead to plant stress.

Ideal: Full sun
FAQ
What kind of sunlight does Citron day-lily require?

Citron day-lilies require full sun daily, with at least six hours of sunlight to keep their leaves, roots, and blooms healthy. While most perennials also require six hours of sunlight, plants like the Orange Daylily or Giant Coreopsis can survive with as little as three hours of sunlight each day. However, these flowering perennials won't flourish as they would in sunnier conditions.

Can the sun harm Citron day-lilies? How can I keep Citron day-lilies safe from the sun and heat?

In warm climates, some Perennial Flowering Plants may struggle with excessive heat and suffer from sun damage. They can wilt, dry out, or even experience growth problems if they are consistently exposed to the intense afternoon sun. However, not all plants require protection from the light afternoon sun. For those that are harmed by intense afternoon exposure, it is recommended to provide them with some shade in warmer climates. Gardeners can achieve this by planting these plants in areas that do not receive direct heat during the afternoon, such as under trees or behind bushes.

Should I keep the Citron day-lily away from the sun?

Certain perennial plants require ample sunlight to reach their maximum bloom. However, in warmer climates, some of these plants actually benefit from less sun. For instance, individuals residing in hotter regions might find it beneficial to shade their flowering perennials during the intense afternoon sun, especially during summer months. Although many perennial flowering plants prefer partial shade in the hottest climates, there are exceptions. Take the Giant Coreopsis, for example, as it is not bothered by excessive sun exposure. These plants can flourish even when placed in the full sun during scorching weather.

What happens if a Citron day-lily doesn't get enough sunlight?

If your Citron day-lilies are not receiving enough sunlight, you will see signs of their insufficient needs. In general, these plants will have fewer blooms compared to those in full sun. Some plants may also develop dry spots on their leaves, but most will still manage to bloom despite the insufficient sun. However, the flowers will be smaller and less robust in appearance.

Do Citron day-lilies need extra attention with sunlight at different times while they are growing?

Citron day-lily is a wonderful flower for gardens and thrives when exposed to at least six hours of sunlight per day. However, in order to extend its freshness, it can benefit from partial shade during the hottest parts of the day. When the day-lily is young, it's important to strike a balance between sunlight exposure and protecting the plants from intense afternoon heat. On the other hand, when the plant is fully mature, it should receive ample sunlight to support its continued growth.

🌑️ Temperature 5–35Β°C

Citron day-lily is a plant that does well in moderate temperatures, specifically between 41 and 95 Β°F (5 to 35 ℃). Originating in temperate regions, it can tolerate seasonal temperature changes. Care may need to be adjusted if temperatures move outside this range.

Ideal temperature: 5–35Β°C
FAQ
What temperature is best for Citron day-lily?

The ideal temperature for Citron day-lilies depends on the time of year. There are two main seasons to consider: the growing season and the dormancy season. During the growing season, when the day-lilies have started to sprout, the best temperature range is between 65-80℉ (18-27℃). If it gets colder than 15℉ (-10℃), the plant may suffer and its leaves could turn brown and wilt. However, if it's just a short cold spell, the Citron day-lilies might survive with some assistance. In the warmer months, it's important to protect the day-lilies from extremely high temperatures. The maximum temperature range for this plant is 95-105℉ (35-40℃). Anything above that can harm the leaves and flowers, causing them to wilt, droop, and potentially get sunburned. Fortunately, there are several easy and quick ways to prevent this issue.

Citron day-lilies need specific temperatures during their first year or when they are still seedlings.

If you have just planted a Citron day-lily for the first time, it may need extra care during the coldest months. Frost can cause severe damage and prevent it from growing back well in the spring. To protect the plant, you should keep it at a temperature above 40℉(5℃) until it is fully established. This can be done by either bringing it inside for a month or two, or by using mulch or fabric barriers to protect it from frost. During the first year or two, it is a good idea to plant the Citron day-lily in a shadier spot. Smaller and weaker plants struggle to regulate their temperature properly in hot conditions. Therefore, they should only receive up to five hours of direct sunlight per day, especially if the temperature exceeds 80℉(27℃). To control summer heat, use shadecloth and water or mist the plant frequently.

How do I keep Citron day-lilies safe from very hot or very cold weather?

If cold temperatures below 15℉(-10℃) occur during the growing season, there are measures you can take to protect Citron day-lily from frost or cold damage. If you're growing it in a container, simply bring the container indoors in bright, indirect light until temperatures rise above the lower threshold. If it's planted in the ground, use mulch or horticultural fabric to create an insulated barrier around the plant, shielding it from frost and cold wind. In temperatures hotter than 80℉(27℃) in the shade during the day, be cautious with sunlight exposure for Citron day-lily. Limit it to six hours or less per day, preferably in the morning. Setting up shade cloth or a fine plastic mesh can reduce direct sunlight during the hottest parts of the day. Additionally, consider installing a misting system that slowly releases cooling mist around the base of the plant, effectively lowering ground temperatures.

Recommended temperature range for Citron day-lily during the dormant season.

During the cold winter months, Citron day-lily enters a dormant phase that is crucial for its survival. It is important for the plant not to sprout too early, before the threat of frost has completely passed, as this could be fatal, especially if the plant has already started growing. Ideally, winter temperatures should remain below 32℉(0℃), but anything up to 40℉(5℃) is generally acceptable. However, in certain climates such as woodland rainforests, unexpected warm weather can cause the plant to prematurely sprout. In such cases, it might be necessary to protect the new sprout from potential frost damage by covering it with clear plastic on stakes. This protective setup can be removed once the risk of frost has subsided. Although Citron day-lilies sometimes manage to sprout at the correct time on their own, using this method increases the likelihood of a successful second sprouting.

πŸ’¨ Humidity
Humidity:
πŸͺ΄ Soil 6-7
Soil pH: 6-7
🌱 Fertilizer

The best time to fertilize a Citron day-lily is in early spring, when it is coming out of dormancy and starting active growth. Fertilization supplies essential nutrients for healthy growth. Although the Citron day-lily has relatively low fertilizer needs, fertilizing once a year can improve its survival and encourage better, longer-lasting flowers.

FAQ
Why should I add fertilizer to my Citron day-lily?

Fertilization is important for the Citron day-lily for various reasons. One key benefit of fertilization is that it provides essential nutrients for the plant to grow above and below the ground. However, the Citron day-lily has relatively low fertilization needs. While it can survive without fertilization at times, annual fertilization can greatly benefit the plant. It helps keep the plant alive and promotes the development of better and longer-lasting flowers. Therefore, those who want their Citron day-lily to look its best should maintain regular annual fertilization.

When should I fertilize my Citron day-lily for the best results?

The best time to fertilize a Citron day-lily is in late winter or early spring when it is transitioning from dormancy to active growth. Fertilizing at this time helps promote healthy growth for the season. Fertilizing in the fall is also acceptable, but it's not recommended during summer or winter.

When is it not a good idea to fertilize my Citron day-lily?

To properly fertilize your Citron day-lily, it is essential to know the right time. The best time for fertilization is late winter or early spring, as this plant only needs one feeding per year. Fertilizing during spring, summer, or fall can result in overfertilization and its associated issues. However, if you missed fertilizing in spring, you can feed the plant during the fall. Moreover, it is important to refrain from fertilizing during most of the growing season and also during winter when the Citron day-lily is in a dormant phase without new growth.

What kind of fertilizer should I use for my Citron day-lily?

For a Citron day-lily, any general-purpose fertilizer with balanced amounts of the three main plant nutrients will work well. However, there are specific nutrient blends that may be even more beneficial. Many gardeners believe that higher levels of phosphorus lead to stronger roots and better flowers. Since the Citron day-lily is a flowering plant, using a phosphorus-rich fertilizer might be the best approach. Whether in granular or liquid form, as long as there are enough nutrients present, any fertilizer will do. Aside from manufactured fertilizers, you can also use organic methods to improve the soil for your Citron day-lily. Compost, manure, and similar materials can greatly enhance the growth medium.

How can I put fertilizer on my Citron day-lily?

To fertilize a Citron day-lily, the easiest method is to use granular or pellet fertilizer and apply it to the soil around the plant. It's important to fertilize when the plant is transitioning from its dormant phase to active growth, typically in early spring when shoots start appearing. If you prefer, you can use liquid fertilizer instead, but remember to dilute it with water before applying. Whether using granular or liquid fertilizer, it's recommended to moisten the soil before, during, and after applying the fertilizer.

πŸͺ΄ Pot & Repot
βœ‚οΈ Pruning

The citron daylily flourishes with vibrant yellow flowers and a sweet fragrance. To maintain its health and appearance, prune the plant from early to late spring. This involves deadheading spent blooms and cutting back any withered foliage. Additionally, trim any damaged leaves to improve its look and prevent disease, which will support robust growth and reduce the risk of fungal infections.

🌿 Propagating
πŸ› Diseases & pets
☠️ Toxicity

Characteristics

Plant Type
Herb
Life Cycle
Perennial
Genus
Hemerocallis
Family
Asphodelaceae
Hardiness Zone
5-10
Mature Height
0.91 m to 1.22 m
Mature Spread
91 cm
Leaf Color
Green
Leaf Type
Deciduous
Flower Color
Yellow
Flower Size
15.24 cm
Bloom Time
Summer
Planting Time
Spring, Autumn
Harvest Time
Late summer, Early fall, Mid fall
Native Area
Russia, Koppen, South Korea, China

Tags (23)

Common Names (4)

en Citron day-lily
en Long yellow day-lily
en Citron daylily
en Long yellow daylily