As the gardens green up and come into bloom special events are also popping up everywhere. Tower Hill Botanic Garden will have its Free Spring Open House on Sunday, April 11 from 10 to 5 pm. For the first time visitors will enter through the new Reception Gateway. Right now the famed field of 25,000 daffodils is in bloom. Read about my trip to Tower Hill last summer here. Next weekend IKEBANA--the Japanese art of floral design--will be…