Apologies for misunderstanding, but it would not be practicable for me to provide a 15,000-word article in one response. However, I can certainly initiate the writing on this topic, giving a comprehensive idea for the first few paragraphs.

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Proper care and maintenance of plants during the winter months can dramatically impact their healthy growth and survival. When temperatures plummet, many varieties of flora enter a dormant phase, delaying their active growth until warmer conditions prevail. However, this dormant state does not mean they are inactive; inherent processes continue albeit at a slower pace. This fact necessitates the involvement from human caretakers to help them endure the harsh season. Knowing what to do can seem challenging, especially considering the vast variety of plant types with different care requirements; yet, general practices can significantly help any plant flourish despite frigid conditions.

Typically, our foliage friends fall into one of two categories: indoor plants and outdoor plants. Both these categories have unique needs and challenges when it comes to their sustenance. Let’s dissect these categories and delve deep into potential strategies you can adopt to keep your plants alive and thriving through winter.

Indoor plants are typically more sheltered than their outdoor counterparts. These housemates experience steadier conditions and are less susceptible to drastic temperature shifts. However, they do feel the effects of winter, like reduced light, lower humidity levels, and changes in care received from their human companions. Here are some tips for maintaining these green companions during winter.

Balancing light needs is the foremost aspect. As winter days are shorter, sunlight becomes a scarce commodity. It’s critical to ensure your indoor plants receive adequate light, essential for their photosynthesis. Moving your plants closer to south-facing windows can help them absorb more sunlight. Couple this strategy with cleaning your windows to allow maximum light to penetrate. If natural sunlight is insufficient, artificial options, like full-spectrum light bulbs, can be a solid adjunct or substitute. Equally important is to rotate your plants occasionally, ensuring all sides receive equal light exposure, promoting uniform growth.

Paying attention to temperature and humidity is also paramount. Indoor heating systems in winter can create an arid environment, not ideal for most houseplants, which prefer humidity. Grouping your plants together or placing them on a pebble tray with water can increase the ambient humidity. Regular misting of leaves can also accomplish this, though be mindful of potential risks, including fungal diseases. Monitoring the temperature of your indoor spaces will prevent your plants from freezing – a quick killer. Most houseplants prefer temperatures around 65-75°F during the day and 10-15 degrees cooler at night.

Watering and feeding are aspects where winter care indeed varies from other seasons. Overwatering is a common plant-killer at any time, but the risk increases during winter. As plants are less active, their water and nutrient needs reduce. Therefore, you should decrease watering frequency, wait for the plant’s topsoil to dry out between waterings. Simultaneously, reducing fertilizer usage, except for plants still actively growing, prevent potential chemical burns.

Transplanting should be avoided during winter. As most plants are dormant, their growth is minimized, meaning they are less likely to recover quickly from a transplant. It’s best to wait for spring, when plants resume their growth and can more readily adapt.

When it comes to outdoor plants, the story changes somewhat. These varieties, whether perennial or annual, have different care requirements due to their exposure to severe cold and potentially challenging weather conditions…

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This is a starting point for your detailed article. With continuation, it would be possible to discuss many more areas of plant care during winter, such as mulching, wrapping, selecting the right plants, winter-pruning, preventing common winter pests and diseases, and much more for a comprehensive guide on winter plant maintenance.