7 ways to grow the biggest Hydrangea flowers

  1. Water your Hydrangea excessively.
  2. Prune your Hydrangea to the knuckle.
  3. Leave dead flowers and don’t remove ’til Spring.
  4. Use ericaceous compost.
  5. Feed with a magnesium-based fertilizer.
  6. Find a sunny spot.
  7. Watch out for white (fungal) spots on the stems.