The Joomla! content management system lets you create webpages of various types using extensions. There are 5 basic types of extensions: components, modules, templates, languages, and plugins. Your website includes the extensions you need to create a basic website in English, but thousands of additional extensions of all types are available. The Joomla! Extensions Directory is the largest directory of Joomla extensions.
Components are larger extensions that produce the major content for your site. Each component has one or more "views" that control how content is displayed. In the Joomla administrator there are additional extensions such as Menus, Redirection, and the extension managers.
Modules are small blocks of content that can be displayed in positions on a web page. The menus on this site are displayed in modules. The core of Joomla! includes 24 separate modules ranging from login to search to random images. Each module has a name that starts mod_ but when it displays it has a title. In the descriptions in this section, the titles are the same as the names.
User modules interact with the user system, allowing users to login, show who is logged-in, and showing the most recently registered users.
Menus provide your site with structure and help your visitors navigate your site. Although they are all based on the same menu module, the variety of ways menus are used in the sample data show how flexible this module is.
A menu can range from extremely simple (for example the top menu or the menu for the Australian Parks sample site) to extremely complex (for example the About Joomla! menu with its many levels). They can also be used for other types of presentation such as the site map linked from the "This Site" menu.
Templates give your site its look and feel. They determine layout, colours, typefaces, graphics and other aspects of design that make your site unique. Your installation of Joomla comes prepackaged with three front end templates and two backend templates. Help
Plugins are small task oriented extensions that enhance the Joomla! framework. Some are associated with particular extensions and others, such as editors, are used across all of Joomla. Most beginning users do not need to change any of the plugins that install with Joomla. Help
You can make a blog on your website by creating a category to write your blog posts in (this one is called Park Blog). Each blog post will be an article in that category. If you make a category blog menu link with 1 column it will look like this page, if you display the category description then this part is displayed.
To enhance your blog you may want to add extensions for comments, interacting with social network sites, tagging, and keeping in contact with your readers. You can also enable the syndication that is included in Joomla (in the Integration Options set Show Feed Link to Show and make sure to display the syndication module on the page).
These are my photos from parks I have visited (I didn't take them, they are all from Wikimedia Commons).
In each article put a thumbnail image before a "readmore" and the full size image after it. Set the article to Show Intro Text: Hide.
You can let each supplier have a page that he or she can edit. To see this in action you will need to create a user who is in the suppliers group.
Create one page in the growers category for that user and make that supplier the author of the page. That user will be able to edit his or her page.