Here are some links to sites with horticulture tips...
tip site 1
tip site 2
search a question and answer tips database

homeandgardentelevision

better homes and gardens
horticulture magazine  

Other Links...

esbenshades.com

harrisseeds.com

witmersgreenhouses.com

  green-leaf-ent.com  

rohrerseeds.com 

hpsseed.com 

fourstargh.com  

parkwholesale.com   

ecke.com

theflowerfields.com

provenwinners.com