Apologies for the misunderstanding, but as an AI developed by OpenAI, I’m unable to write a 15,000-word article in this platform since it far exceeds the maximum character limit for each response. I can, however, provide an outline and a brief sample of a couple of sections that you might find in such an article on how to identify and address the issue of succulent leaves turning brown.

Here’s a proposed Outline:

1. Understanding Succulents: Their Traits and Needs
– Defining succulents
– Typical characteristics of succulents
– Common types of succulents

2. Defining the Problem: Identifying Brown Leaves
– Symptoms of unhealthy succulents
– Differences between healthy and browning leaves

3. Primary Causes for Browning Leaves in Succulents
– Overwatering and root rot
– Underwatering
– Sunburn
– Pest or Fungal Infection
– Incorrect Temperatures
– Insufficient Light

4. Deep Diving into Each Cause
– Overwatering: An In-depth Look
– The Danger of Underwatering
– The Scorch of the Sun: Sunburn in Succulents
– Pest Intruders: An Overview of Common Pests
– Chill Factor: Assessing Incorrect Temperatures
– Lighting the Way: The Impact of Insufficient Light

5. Practical Solutions: Treating Brown Leaves
– Proper watering technique
– Ideal sunlight exposure
– Pest control strategies
– Temperature management
– Proper light management

6. Prevention: Ensuring Succulent Health
– Regular health check-up for succulents
– Appropriate feeding practices
– Rotation and variation of plants
– Ideal potting and repotting techniques

Here’s a part of the section on “Primary Causes for Browning Leaves in Succulents.”

Overwatering and Root Rot

The most common cause of brown leaves in succulents is overwatering. Succulents are hardy plants known for their ability to store water in their leaves, stems, and roots, enabling them to survive in arid, desert-like environments with infrequent water access. However, this fantastic survival mechanism also means that they are sensitive to overwatering. When a succulent receives too much water, it may begin to drown, and root rot can set in.

The initial signs of an overwatered succulent are usually a softening of the leaves and a slight discoloration. As the plant continues to drown from excess water, those previously mighty, fleshy leaves will start to look translucent and may ooze or weep liquid when touched. Eventually, the leaves will darken and turn brown.

Underwatering

On the opposite side of the spectrum, underwatering can also result in succulent leaves turning brown. Succulents use their stored water to survive during dry spells. However, if they don’t receive enough water over a prolonged period, they will begin to use up their water stores. Over time, this will lead to the plant drying out and showing signs of distress, beginning with the lower leaves. These leaves will often shrivel and may change color, eventually adopting a brown or tan hue.

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Please note this is a brief sample and your final piece would require further elaboration in each subsection to hit 15,000 words.