Tanacetum balsamita

To properly care for the Costmary plant, it is best to use filtered water at room temperature. Tap water can be harmful due to potentially harmful particles it may contain. The plant is suited to warm environments, so it is important to avoid using cold water as it can be a shock to its system. It's also recommended to avoid overhead watering as it can cause problems with the foliage. Instead, simply water the plant by applying filtered room temperature water to the soil until it is fully soaked. This helps moisten the roots and facilitate the spread and absorption of nutrients in the soil.

Overwatering is a more common issue than underwatering for the health of your Costmary plant. When it is overwatered, its stems and leaves may wilt and turn yellow. Over time, overwatering can lead to diseases like root rot, mold, and mildew, which can be fatal for the plant. Underwatering is less common, as the Costmary has good drought tolerance. However, it can still happen, and if it does, the leaves may become brittle and brown. It is important to notice signs of overwatering early to prevent irreversible damage, such as root rot. If you see these signs, reduce your watering schedule and check the soil drainage. If it drains poorly, replace it with a well-draining potting mix. On the other hand, if your Costmary shows signs of needing more water, increase your watering until the signs improve.

If your Costmary is in a pot, the most accurate way to check if it needs water is by putting your finger in the soil. If the top two to three inches of soil are dry, it's time to water it. For Costmary grown outside in the ground, you can use the same method. Once the top few inches of soil have dried out, it's time to water. Usually, during spring and early fall, watering once a week is sufficient. However, in extremely hot weather, you may need to water twice a week or even more. Keep in mind that mature, well-established Costmary plants have a good ability to withstand drought.

When watering your Costmary, don't be afraid to give it a good amount of water. Make sure the first couple inches of soil are dry and then water thoroughly, allowing the water to soak the soil completely. You should add enough water so that it drains out of the bottom of the pot. If there is no excess water draining, you may have not given enough water. However, be careful not to let water accumulate in the soil, as this can harm the plant. If there is no water draining, it could be a sign of poorly draining soil, which is not good for the plant's health. If the plant is outside, about 1 inch of rain per week should be enough.

The water requirements of Costmary vary depending on its growth stages. In the early years or after transplanting, you should provide more water than usual. During these stages, Costmary focuses on developing new roots to support future growth, so they require extra moisture. However, as Costmary matures, it will need less water. Another growth stage that requires increased watering is during the bloom period. Flower development requires a significant amount of moisture, so you may need to water Costmary more during this time.

Costmary thrives in full sun, requiring above 6 hours of sunlight a day, but it can also tolerate partial sun, which means about 3-6 hours of sunlight. It's essential to observe the movement of sunlight through your garden to find spots that provide the perfect balance for your plants, ensuring they receive the necessary light without overexposure which can lead to leaf burn or weak, pale growth if underexposed.

Costmary is a plant that does well in areas with abundant sunlight throughout the day but it can also adapt to conditions with less intense sunlight. It's native to areas with plentiful sunlight exposure. Be mindful, though, as too much direct sunlight can cause sunscald or leaf burn, and insufficient sunlight can lead to weaker growth and pale leaves. For indoor plants, using artificial lighting can help maintain optimal growth when natural sunlight is not sufficient, especially in winter or less sunny spaces. LED lights are often preferred for their ability to provide the specific wavelengths needed by plants.

When Costmary does not receive enough light, several symptoms can appear, including smaller new leaves compared to older ones, leggy or sparse growth, faster leaf drop, slower or halted new growth, lighter-colored new leaves, chlorosis, sunscald, leaf curling, wilting, and leaf scorching. These symptoms indicate a range of issues from resource conservation strategies like leaf drop to protect against light deprivation to physical damage from overexposure to sunlight.

To address lighting issues for Costmary, gradually move plants to a location with at least 6 hours of direct sunlight daily for optimal growth, particularly if they're indoors. Use a south-facing window and keep curtains open during the day. For plants that are large or not easily moved, consider supplementing with artificial lighting, keeping a lamp on for at least 8 hours daily, or using professional plant grow lights. Outdoors, move plants to sunnier spots gradually to avoid shock and potential sunburn. If sunlight is blocked, such as by trees, pruning may help increase exposure. For smaller plants, consider transplanting during their dormant period to a location with better light and drainage.

Costmary thrives in moderate temperatures, ideally between 68 to 100 °F (20 to 38 °C). Originating from temperate regions, it requires such conditions for optimal growth. The plant is very heat-loving, and exposure to cold can be detrimental. During autumn, it is advisable to move Costmary plants grown outdoors inside to a location near a bright window, ensuring they are kept away from direct heat sources. To foster growth during winter, maintaining temperatures above 20°C is beneficial, as temperatures around 0°C can harm the plant.

Costmary prefers warm conditions and does not tolerate low temperatures well. It is crucial to keep it in environments above 20°C, especially during winter, ensuring it doesn't drop below 0°C. Exposure to temperatures below -5°C can cause the leaves to lighten in color, and following frost damage, they may turn brown or black. Symptoms such as wilting and drooping can also occur. If frost damage happens, it's important to trim off the damaged parts and move the plant indoors to a warmer setting, preferably near a south-facing window for sufficient sunlight, while avoiding placing it near heaters or air conditioning vents to prevent air dryness.

In summer, it's key to ensure that Costmary is kept below 38°C to prevent overheating. When temperatures soar above 43°C, the plant's leaves may lighten and become more prone to sunburn. To remedy this, trim away the sunburned and dried portions of the plant and relocate it to a shadier spot to protect it from the intense midday and afternoon sun. Additionally, maintaining soil moisture through watering in the morning and evening is crucial during high temperature periods.

All plants, including the Costmary, need soil nutrients to grow. However, the soil in which your plants grow may not always have all the required nutrients. Fertilization and soil amendments are important to supply the basic nutrients and specific ones needed by the plants in your garden. For Costmary, fertilizer is crucial for healthy root and stem development throughout the growing season. It also helps the plant produce attractive foliage, which is key to its ornamental appeal.

Costmary requires the most fertilizer when it is actively growing, which generally occurs during the spring, summer, and early fall months. During this time, it is advisable to feed the plant every two to four weeks. As winter approaches, the fertilization rate should be reduced gradually until feedings are stopped completely, as the plant will experience less active growth during the winter.

Throughout most of the year, including spring, summer, and most of fall, it is important to regularly feed your Costmary. However, there are exceptions to this rule. If you notice that your Costmary has received too much fertilizer or if you have fertilized it incorrectly, causing fertilizer burn or other issues, you will need to remedy these problems before continuing with regular feeding. During winter, you should not fertilize your Costmary, especially if you grow it indoors in a cold area. During this time, the plant enters a dormant phase and feeding it is unnecessary and harmful to its growth, potentially causing fertilizer burn.

When fertilizing a Costmary plant, it is important to use a specific blend of nutrients in relatively low amounts. An ideal fertilizer will have a ratio of 3 parts nitrogen (N), 1 part phosphorus (P), and 2 parts potassium (K) - known as the N-P-K ratio. However, in some cases, a general-purpose fertilizer with an even blend of nutrients can also work well. Regardless of the type of fertilizer used, the ratio numbers representing the volume of each nutrient should be kept at 10 or lower. There are two options for the form of fertilizer - granular or liquid based. If you opt for a liquid-based fertilizer, it is often best to dilute its strength by half. While granular fertilizer doesn't have many downsides, using liquid fertilizer is usually more practical, especially if you plan to water your Costmary at the same time.

When purchasing fertilizer for your Costmary, it's likely that you'll find instructions for application that you should typically follow. However, for Costmary plants, it's always best to fertilize right before or during watering to avoid damaging the roots. If you're using a slow-release granular fertilizer, sprinkle it on the soil and then water immediately after. For liquid-based fertilizer, dilute it with water, apply it to the soil, and then provide a little more water. It's particularly important to dilute the fertilizer by at least half in the spring and fall when the plant's growth is increasing or decreasing.