Heterotheca subaxillaris

Camphorweed can be tricky to water properly. While their deep roots require weekly moisture, they are highly susceptible to root rot and may develop browning if overwatered. Underwatering is less of a concern as these plants can survive without supplemental watering for a period of time. However, if they are deprived of water for too long, they will wilt and exhibit dry leaves.

Most Camphorweed grow outdoors instead of indoors for a few reasons. Firstly, these plants tend to grow quite tall. Secondly, they require more daily sunlight than most indoor settings can offer. If you manage to find a suitable indoor growing location, you may need to water your Camphorweed more frequently compared to an outdoor setting. This is because indoor environments are generally drier due to HVAC units, and soil in containers can dry out more rapidly than soil in the ground.

Camphorweed (Heterotheca subaxillaris) thrives in full sun, requiring more than 6 hours of sunlight daily, but it can also grow in partial sun, with about 3-6 hours of sunlight. It's essential to observe how sunlight moves through your garden to find spots with the perfect balance of light and shade, ensuring the plants' health and happiness. Camphorweed's origin in a sun-rich environment underscores its need for substantial sunlight exposure, though both too much and too little light can adversely affect its growth.

When natural sunlight is insufficient, especially during winter or in areas receiving less sunlight, artificial lighting can significantly aid Camphorweed's growth indoors. Optimal growth can be achieved by using LED lights, which can be tailored to provide specific wavelengths needed by plants. Full sun plants require 30-50W/sq ft, partial sun plants need 20-30W/sq ft, while full shade plants need 10-20W/sq ft. The artificial light source should be placed 12-36 inches above the plant and kept on for 8-12 hours a day to mimic natural sunlight conditions.

Camphorweed displays several symptoms when it doesn't receive enough sunlight, including the growth of smaller new leaves, leggy or sparse growth, faster leaf drop, and slower or no new growth. Additionally, leaves may develop a pale color or irregular patterns due to insufficient sunlight (chlorophyll deficiency), and chlorosis might occur, leading to yellow leaves. Excessive sunlight, conversely, can lead to symptoms like sunscald, leaf curling to minimize water loss, wilting due to increased transpiration, and leaf scorching, showing brown, dry edges on leaves.

To address sunlight-related issues in Camphorweed, gradually increase its sun exposure to at least 6 hours daily. If moving the plant isn't feasible, like with larger indoor plants, consider using artificial grow lights for a minimum of 8 hours a day. For outdoor plants, ensure a gradual transition to sunnier spots to avoid sunburn. Pruning or transplanting can also help reduce sunlight obstructions. Note that parts of the plant already damaged by insufficient light may not recover, but new growth will be healthy once proper light conditions are met.

Camphorweed, with its botanical name Heterotheca subaxillaris, is indigenous to areas that have a moderate climate range of 68 to 95 °F (20 to 35 °C). It thrives best within these temperature ranges, showing a clear preference for such climates. Altering the habitat temperature beyond this comfort zone could adversely affect its growth.

Camphorweed possesses strong cold resistance, so special frost protection measures are not typically necessary during winter. However, if winter temperatures are expected to drop below -15°C, it's important to provide cold protection to the plant. This can be achieved by covering the plant with soil or straw to insulate it from the cold. Additionally, it is recommended to water the plant abundantly before the first freeze in autumn to ensure the soil remains moist and enters a frozen state, which helps prevent drought and water scarcity for the plant during winter and early spring.

In low temperatures, Camphorweed is cold-tolerant, thriving best above 20°C and should be kept above 0°C during winter. When temperatures fall below -15°C, there might not be noticeable changes during winter, but there could be a decrease in sprouting or even a lack of sprouting during spring. The solution for this is to remove any parts of the plant that have failed to sprout in spring.\n\nIn high temperatures, during summer, Camphorweed should be kept below 35°C. If the temperature exceeds 41°C, the leaves may become lighter in color, prone to curling, susceptible to sunburn, and in severe cases, the entire plant may wilt and dry up. To remedy this, trim away the sunburned and dried-up parts. Move the plant to a location that provides shade from the midday and afternoon sun, or use a shade cloth. Additionally, water the plant in the morning and evening to keep the soil moist.