Here's a list of the essences and where you can find them. (:
Going in order:
Leaf Essence: To find the leaf essence, you have a few options. The most common places to find this Essence are tree stumps, your houses, and Torajiro's house.
Fire Essence: You can find this one by pointing your Extractor at the Cool Trees, as well as Roy's furniture store.
Heart Essence: By planting some of the Lovely Trees, you'll easily be able to find the heart essence. Also, any of the phone booths are good sources for the heart essence.
Water Essence: Searching for fountains around the different areas of the game is the best source for this essence.
Diamond Essence: One of the few places to find the blue diamond essence is at the kayaking race course located in the Mangrove Forest.
Star Essence: As you're building new houses, the star will be the most important essence to have plenty of. Luckily, you can find them in many places such as lamp posts and Lovely House 2.
Brown Diamond Essence: To build up your supply of brown diamonds, you can use your Extractor on most of the flowers you find in your town. Another place to find them is by using the Extractor on the Town Hall.
Bubble Essence: Both of the Curio Shops located in the game will give you the bubble essence. When you get the snowman from the Synth-O-Matic, you will have another source of the bubble essence.
Moon Essence: In the beginning of the game, one of the only places to get this Essence is by using the Extractor on Dr. F's Laboratory. Once you have the Heliport plans, you can use the Extractor to get more of the moon essence.
Question Mark Essence: Trash cans in town will be one of the easiest places to find this Essence. Also, in the Gondola Summit.
Planet Essence: The ski slope, the stone pillar, and the slide will help you build up your collection of the planet essence.
Hope this helps you in your search for the essences and make it easier.
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