The latest Mastodon update lets you follow hashtags. When you follow, posts with a tag appear in your timeline automatically.

Try following #Gardening to make posts about gardening appear in your timeline.

This can be REALLY useful for discovering interesting accounts.

To follow a hashtag:
1. Log in through your server's website
2. Search for hashtag
3. Click it to see its results
4. Click on 👤+ icon in top right (click again to unfollow)

Posts from followed tags are visible in the apps too.

@feditips Would be great in future to have more control over following hashtags; e.g., an option to follow hashtags in a list, instead of in the home timeline.

@stokes @feditips you can set up a separate timeline with hashtags only.

Go to preferecences; then appearance. Click ”advanced views. Now when you seach for a hashtag, click the settings icon and then pin. The timeline will appear.

To add more tags, click the settings icon of that newly created timeline and click ”add more hashtags”.

@FrankenGraphics @feditips Ah! Great tip, thanks. Will this not also put posts with that hashtag in my home timeline as well? If not, that's exactly what I was after! Thanks again.
@FrankenGraphics @feditips Oh! Pin the hashtag timeline but don't follow it. Just realised. Perfect, thank you!
@stokes @feditips yeah exactly! It’s a greatway to deal with tags you’re interested in, but are too popular/active to follow in your main timeline