White four o'clock shows strong resistance to disease and is generally unlikely to develop illnesses. Still, it can be affected by pests and diseases present in its surroundings. Such infections are generally mild. For care, this plant needs moderate maintenance. It should be pruned regularly to keep a tidy appearance and support healthy growth. Fertilizing can also help encourage flowering. White four o'clock is suitable for anyone with an outdoor area, like a garden or patio, and does not require extensive care experience. It may need extra attention when grown indoors.
How to keep Mirabilis Albida.
Light
White four-o'clock flourishes with plentiful light. Although it can tolerate lower light conditions, it requires ample illumination to achieve optimal growth. Coming from sunny habitats, inadequate light impairs its health and development, resulting in weaker, less vigorous specimens.
Water
Native to regions with distinct wet and dry seasons, the white four o'clock plant flourishes with consistent moisture but can also tolerate short periods of drought. To keep the plant healthy, water it weekly. When grown outdoors, applying mulch helps retain soil moisture and reduces the need for frequent watering.
Temperature
White four o'clock is native to temperate regions and does well in temperatures from 32 to 100.4°F (0 to 38℃). Seasonal temperature adjustments may be required to maintain the plant's health.
Fertilizer
The best time to fertilize a White four o'clock is in early spring, as it comes out of dormancy and begins active growth. Fertilizing supplies the essential nutrients needed for healthy development. Although White four o'clock has fairly low fertilizer requirements, an annual application can improve its survival and encourage better, longer-lasting blooms.
Pruning
The white four o'clock is a hardy perennial known for its fragrant flowers that bloom in the evening. To encourage a bushier shape and more blooms, prune the plant from early to late spring. Be sure to remove any dead stems and thin out overcrowded areas to improve air circulation. Regular, light pruning will promote growth and ensure continuous blooming.
Botanical profile.
- Plant Type
- Herb, Shrub
- Life Cycle
- Perennial
- Genus
- Mirabilis
- Family
- Nyctaginaceae
- Hardiness Zone
- 3-11
- Mature Height
- 30 cm to 91 cm
- Mature Spread
- 30 cm to 46 cm
- Leaf Color
- Green
- Leaf Type
- Deciduous
- Flower Color
- White
- Flower Size
- 2.03 cm to 3.05 cm
- Bloom Time
- Summer, Early fall
- Planting Time
- Spring, Autumn
- Harvest Time
- Late summer, Fall
- Native Area
- Mexico
Other names.
Reader questions.
What are the sunlight requirements for White four o'clock (Mirabilis albida)?
White four o'clock thrives best under conditions that provide full sun, which means the plant requires more than 6 hours of sunlight daily. However, it can also grow in partial sun, receiving about 3-6 hours of sunlight. It's important to observe the movement of sunlight through your garden to find a spot that offers a good balance of light and shade, ensuring the plant's health and happiness.
What is the ideal temperature range for White four o'clock?
White four o'clock thrives in temperate environments, ideally within a temperature range of 32 to 100.4°F (0 to 38°C). This plant is native to regions where seasonal adjustments may be required to maintain its health due to temperature variations.
Why is sufficient light important for White four o'clock, and how can artificial lighting be used?
Sufficient light is crucial for the optimal growth of White four o'clock, a plant that originates from areas with ample sunshine, and thus, it performs best under abundant light exposure. Inadequate light can lead to weaker growth and a less vigorous plant. When natural sunlight is not enough, especially during winter or in less sunny spaces, artificial lighting can be a lifesaver. Using the right type of artificial light, such as LED lights, and adjusting for the correct intensity and distance can significantly promote healthier and faster plant growth. For full sun plants, 30-50W/sq ft of artificial light is recommended, 20-30W/sq ft for partial sun plants, and 10-20W/sq ft for full shade plants. The lighting should be placed 12-36 inches above the plant and kept on for 8-12 hours per day to mimic natural daylight hours.
Does White four o'clock require frost protection during winter?
White four o'clock has strong cold resistance and usually does not need special frost protection measures during winter. However, if temperatures are anticipated to drop below -35°C, it's important to protect the plant using soil or straw coverings. Additionally, watering the plant abundantly before the first freeze can help keep the soil moist, preventing drought and water scarcity throughout the winter and early spring.
What are the symptoms of inadequate sunlight for White four o'clock, and how can excessive sunlight affect it?
In rooms with inadequate lighting, White four o'clock may not show symptoms of light deficiency right away, but eventually, symptoms such as smaller new leaves, leggy or sparse growth, faster leaf drop, slowed or halted growth, and lighter-colored new leaves can occur, indicating insufficient sunlight. On the flip side, excessive sunlight exposure can lead to chlorosis, sunscald, leaf curling, wilting, and leaf scorching, negatively impacting the plant's health by causing damage to leaves or stems and affecting its ability to maintain hydration and perform photosynthesis.
How does low temperature affect White four o'clock and what are the solutions?
White four o'clock is cold-tolerant and performs best in temperatures above 0°C. In winters, it's crucial to maintain temperatures above -30°C. If temperatures fall below -35°C, the plant may not show immediate signs of distress, but you might notice a decrease in sprouting or no sprouting at all come spring. To address this, remove any parts of the plant that have failed to sprout in the spring.
What are the solutions for light-related problems in White four o'clock?
For indoor plants, to combat light deficiency, gradually move the plant to a sunnier spot until it receives at least 6 hours of direct sunlight daily, utilizing a south-facing window and keeping curtains open during the day. If moving the plant is not feasible, supplement with artificial light, keeping a lamp on for at least 8 hours daily, or consider professional grow lights. For outdoor plants, incrementally move them to sunnier spots to prevent sunburn. If sunlight is being obstructed by trees, pruning may be necessary to let more light through. For smaller plants that can be moved, consider transplanting them during their dormant period to a location with better sunlight exposure and good drainage. Note that parts of the plant damaged by insufficient sunlight may not fully recover, but new growth should be healthy with improved light conditions.
What should I do if White four o'clock experiences high temperatures?
During the summer, it's important to ensure that White four o'clock remains in temperatures below 38°C. Exposure to temperatures above 43°C can cause the leaves to lighten in color, curl, become prone to sunburn, and, in severe cases, lead to the wilting and drying of the entire plant. To mitigate these effects, trim away the sunburned and dried-up parts of the plant, relocate it to a shaded area or use shade cloth to protect it from the midday and afternoon sun, and water the plant in the morning and evening to maintain soil moisture.
