Aside from Ace Hardware in SMs or Robinsons, there are other shops that offer plenty of garden supplies. Have you been to the following places?
1.Eton Centris Sunday Market
3.Cartimar Shopping Center
4.Farmers Garden in Cubao
6.Quezon City Circle stalls
You'll find lots of flowers, plants, plastic and ceramics pots for sale on any of the location mentioned above.