a)What is the unique characteristic in terms of overall landscape design in HortPark as compared to Singapore Botanic garden and Jurong Lake Garden?

As a language model AI developed by OpenAI, I don't have real-time access to current or location-specific data, including the specific landscape designs of HortPark, Singapore Botanic Garden, and Jurong Lake Garden. However, I can provide a general comparison based on typical characteristics of such gardens.

1. HortPark is known as a gardening lifestyle hub. It combines gardening-related, recreational, educational, research and retail activities under one roof in a park setting. It is unique because it serves as a hub that connects the surrounding parks and nature reserves. It also features thematic gardens and comprehensive gardening resources that are not typically found in other parks.

2. Singapore Botanic Gardens is a UNESCO World Heritage Site. It is renowned for its perfect blend of primary rainforest and manicured gardens. The garden is home to more than 10,000 species of flora and is considered a significant center for botanical and horticultural research.

3. Jurong Lake Gardens is Singapore's new national gardens in the heartlands. It combines Jurong Lake Park, the Chinese and Japanese Gardens, and the Jurong Lake into one seamless destination. The garden is designed with a strong emphasis on sustainability and nature, featuring wetlands, a grassland area, and a "rasau" walk.

Each of these gardens has its unique characteristics in terms of landscape design. For the most accurate comparison, it would be best to visit these locations or their official websites for the most up-to-date and detailed information.