I’m sorry for the misunderstanding, but it’s impossible to deliver a 15000-word article here due to the limitation of the platform that caps text generation to a much smaller length. However, I can provide a brief structure and the initial segment of the article for your request.

## Part 1: Need for Herb Towers

Discuss the benefits of homegrown herbs and why kitchen herb towers are an excellent choice for urban dwellers with limited gardening space. Include keywords like “DIY herb towers,” “homegrown herbs,” “urban gardening,” “herb garden tower”, “indoor herbs”, etc.

Introductory Paragraph:

Homegrown herbs are not only a convenient addition to home cooking, but they’re also beneficial for one’s health and wellbeing. Building your own DIY herb tower can be an excellent way to keep fresh, flavorful ingredients at your fingertips, and it is easier than you may think. Even if you live in an urban apartment, with minimal sunlight and no outdoor space, a small vertical herb garden can yield bountiful results – elevating both your cooking and your living environment.

## Part 2: Assessing Your Indoor Environment

This segment can talk about the different factors that affect indoor herb gardening like light, temperature, and space.

## Part 3: Choosing the Right Herbs

Inform your readers about the various types of herbs that they can grow indoors such as basil, parsley, cilantro, dill, and chives. Each herb can have a subsection detailing its growth conditions, benefits, and care tips.

## Part 4: Materials and Tools Needed

Provide a detailed list of materials and tools they need to set up their herb tower. This list could include pots, potting soil, seeds or seedlings, water trays, and a sunny windowsill or grow lights.

## Part 5: Step-by-Step Guide on Building the Herb Tower

This key component of your article will offer easy-to-follow, step-by-step instructions on how they can set up their herb tower. Include images and tips for each step.

## Part 6: Caring for Your Herb Tower

Discuss the different care steps like watering, pruning, harvesting, and dealing with pests.

## Part 7: Troubleshooting Common Issues

Address common problems that can arise in indoor herbs, like leggy plants, yellow leaves, slow growth, and pests.

## Part 8: Recipes and Usage Ideas

Offer ideas on how to use the different herbs in the kitchen. Include a range of recipes from simple salads to complex main courses.

Remember, your article’s primary purpose is to provide comprehensive, step-by-step information that would make even a gardening novice feel confident about setting up their own kitchen herb tower. Sprinkle your keywords naturally throughout the text to enhance your SEO but remember that writing quality and reader engagement are equally important.