I have prepared a list seeds shop which sell seasonal/permanent flowers seeds. Currently this is for lahore.These shops also sell gardening tools and fertilizers and various gardening accessories.-->
Sunny View Seed Store Old Club Lahore Mian Muhammad Farooq 04236301925 0321-9401925 They are probably oldest and have got some seeds not available anywhere else including moon flowers.
Pride Seed Store, Hussain Chowk Lahore Muhammad Ashfaq 04235763069, 0300-8436799 They also sell cactus and other succulents. This is their website http://prideseedstore.com/
Chanan Din Seeds, Gulberg Lahore Mian Usman 04235763898, 0300-4231410 I think they have got largest bulbs collection in the season i.e in fall and summer bulbs.
Arain Seeds , Sabzi mandi,
Multan chungi 04235422358 They also sell seedlings for veggies and seasonal flower seedlings. This is their website http://www.arain-seeds.com/ Lahore
More Green seeds,
Liberty market Lahore 04235875547
You can also get garden accessories from Metro and Hyper-star but they are a bit expensive.