There are many colleges or institutes that offer Horticulture in their curriculum in India, here I am listing the names and contact detail of some of them and attaching a file that will have all the detail information regarding this which you can download for free:

A.K.S. University
Sherganj, Panna Road
Satna, Madhya Pradesh

Agricultural College and Research Institute Madurai (AC&RI)
Pallapuram Post Kumulur
Trichy, Tamil Nadu

Agricultural College and Research Institute, Madurai
Madurai, Tamil Nadu

Babasaheb Bhimrao Ambedkar University (BBAU)
Vidya Vihar, Rai Bareilly Road
Lucknow, Uttar Pradesh

Bihar Agricultural University
Sabour
Bhagalpur, Bihar

Birsa Agricultural University
Kanke
Ranchi, Jharkhand

Chandra Shekhar Azad University of Agriculture and Technology
Nawabganj,
Kanpur, Uttar Pradesh

Chaudhary Charan Singh Haryana Agricultural University
Hisar, Haryana

Chaudhary Charan Singh University / Meerut University
Ramgarhi
Meerut, Uttar Pradesh

Chaudhary Sarwan Kumar Agricultural Vishvavidyalaya
Palampur
Palampur, Himachal Pradesh

College of Horticulture & Forestry
P.O. Jhalarpattan city
Jhalawar, Rajasthan
(07432) 241155
(07432) 242155

Doon Post Graduate College of Agriculture Science and Technology
28- Chakrata Road, (Behind Bindal Petrol Pump)
Dehradun, Uttarakhand
(0135) 2629375, 2720894
9837039652, 9837008360
(0135) 2720894

Dr. Panjabrao Deshmukh Krishi Vidyapeeth
P.O. Krishi Nagar
Akola, Maharashtra
(0724) 2258365, 2258372, 2258184, 2258200, 2258217
(0724) 2258219, 2258372

Dr. Y.S.R. Horticultural University
Post Box #7, Venkataramannagudem
West Godavari, Andhra Pradesh
(08818) 284311
7382633644
(08818) 284223

Ganga Kaveri Institute of Science & Management
No.1699 (43/1), Dr.Rajkumar Road, 3rd Stage, Rajajinagar
Bangalore, Karnataka
(080) 23122701, 23527887
9845695833, 9980404153
(080) 23527245

Govind Ballabh Pant University of Agriculture and Technology
District- Udham Singh Nagar,
Pantnagar, Uttarakhand
(05944) 233320, 233350
(05944) 233473

Hemwati Nandan Bahuguna Garhwal University
Srinagar
Garhwal, Uttarakhand
(01346) 252167, 252143, 2750012
(01346) 252174, 252247

Indian Agricultural Research Institute
Pusa
Delhi, Delhi
(011) 25733367, 25843375, 25733378, 25782221, 25782223
(011) 25846402

ITM University
ITM University
Opp. Sithouli Railway Station, NH. 75 Sithouli, Jhansi Road,
Gwalior, Madhya Pradesh
(0751) 2432977, 2432989, 2432389, 2432390
(0751) 2432988

Junagadh Agricultural University
Motibag,
Junagadh, Gujarat
(0285) 2670289, 2672080, 2672081, 2672082, 2672090
9879104660
(0285) 2672482

Rajendra Agricultural University
Pusa
Samastipur, Bihar
(06274) 240239, 240243, 240251, 240270, 240265, 240272
9430460056
(06274) 240266

S.V. Agricultural College
Tirupati
Chittoor, Andhra Pradesh
(0877) 2249155, 2248667
(0877) 2248001, 2248667

Sardar Vallabh Bhai Patel University of Agriculture and Technology
Modipuram
Meerut, Uttar Pradesh
(0121) 2888514, 2888590, 2888522, 2888522
9412593692, 9319380093, 9358870935
(0121) 2888505, 2888525, 2888505

Sardarkrushinagar Dantiwada Agricultural University
Sardarkrushinagar
Palanpur, Gujarat
(02748) 278226, 278222, 278444
9426704884
(02748) 278433, 278234

Shivaji University
Vidyanagar
Kolhapur, Maharashtra
(0231) 2609000, 2609060, 2609063
(0231) 2691533, 2692333

Smt. Genda Devi P.G. College
Allipur, Barbara, Kasganj
Kashanj, Uttar Pradesh
(05744) 244780
9412095310, 9319640302, 9837316633, 9412734313
(05744) 244780

Tirhut College of Agriculture
Dholi, Muzaffarpur Pusa Road
Muzzafarpur, Bihar
(0621) 2290386

Udai Pratap Autonomous College
Varanasi, Uttar Pradesh
(0542) 2282399
9415227770
(0542) 2282399

University of Agricultural Sciences - Bangalore
Gandhi Krishi Vignyan Kendra
Bangalore, Karnataka
(080) 23330684, 23330984, 23330984, 23332442, 23330153
9449866900, 9448966901, 9449866910
(080) 23636826, 23330153

University of Agricultural Sciences - Dharwad
Krishi Nagar
Dharwad, Karnataka
(0836) 2747958, 2448512, 2448321, 2448413, 2448512
(0836) 2745276, 2448349