I hired a plumber to help me restore an old farmhouse, and after he had just finished a rough first day on the job, a flat tyre made him lose an hour of work, his electric drill quit and his ancient one-ton truck refused to start. While I drove him home, he sat in stony silence.

On arriving he invited me in to meet his family. As we walked towards the front door, he paused briefly at a tree, touching the tips of the tree. When opening the door he underwent an amazing transformation.

His tanned face was wreathed in smiles and he hugged his two small children and gave them a kiss. Afterward he walked me to the car. We passed the tree and my curiosity got the better of me. I asked him about what I had seen him do earlier.

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HortPark is a one-stop gardening hub that brings together gardening-related, recreational, educational, research and retail activities under one big canopy in a park setting.  It is a knowledge hub for plants and gardening and provides the platform for the industry to share best practices and showcase garden designs, products and services.  This 23-hectare regional park in South-Western Singapore is also a park connector, connecting Telok Blangah Hill Park to Kent Ridge Park.

As a gardening hub, HortPark aspires to nurture a gardening culture by focusing on 3 key areas of:

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Formerly known as Everbloom Mushroom Farm.

Visit the Singapore’s chief supplier of fresh mushrooms and mushroom products in Singapore that produces fifteen tonnes of Shiitake per month for export and local markets! It is the only large-scale bio-technology mushroom farm in Singapore.

Not sure if they are conducting farm tours anymore, but there are lots of reviews by students who had visited the farm.  Here's one from Crescent Girls school.

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Opening hours:
Monday to Friday - 8.00am to 5.00pm
Saturday - 8.00am to 10.30pm
Sunday - 8.00am to 5.00pm
Public Holidays - 8.00am to 3.00pm

Admission is free of charge.

The orchid is the national flower of Singapore and Orchidville is the largest orchid farm in Singapore, occupying 43 hectares of land in the Mandai Agrotechnology Park.

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Opening hours: 9am to 5pm daily

Since 1991, Oh Farms has attracted visitors from worldwide.  The farm is located within Singapore's Agrotechnology Parks.

Guided tours are organized by advanced booking. There are two programmes to cater to different interests: Hydroponics Farm Tour and Herbs and Spices Tour.

Reservations may be made by booking online or contacting the farm directly by phone or fax or email.

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Opening hours: 9am to 5pm (Weekdays); 9 am to 6pm (Weekends)

Aero-Green Farm Visit is a farm with a great difference, especially for urban dwellers!

Catch a glimpse of egg plants, cherry tomatoes, long beans, ladies fingers, herbs and many more! * subject to seasonal availability.

Visitors are usually ushered into a video room to view and learn about aeroponic technology before proceeding on the farm walkabout. Not only vegetables are grown here, but also fruits and herbs.