Flowering Plants pH Requirement

For most plants, the optimum pH range is from 5.5 to 7.0. But some plants will grow in more acidic soil or may require a more alkaline level. The pH is not an indication of fertility, but it does affect the availability of fertilizer nutrients.

  • Anthurium 5.0 – 7.5
  • Alyssum 6.0 – 7.5
  • Ageratum 6.0 – 7.5
  • Aster 5.5 – 7.5
  • Azalea 4.5 – 5.5
  • Begonia 5.5 – 7.0
  • Bougainvillea 5.0 – 8.0
  • Camellia 4.5 – 5.5
  • Cactus 4.5 – 6.0
  • Calendula 5.5 – 7.0
  • Candytuft 6.0 – 7.5
  • Celosia 6.0 – 7.0
  • Cleome 6.0 – 7.0
  • Columbine 6.0 – 7.0
  • Coreopsis 5.0 – 6.0
  • Cosmos 5.0 – 8.0
  • Crocus 6.0 – 8.0
  • Carnation 5.0 – 8.0
  • Chrysanthemum 5.0 – 8.0
  • Daffodil 6.0 – 6.5
  • Dahlia 6.0 – 7.5
  • Day Lily 6.0 – 8.0
  • Delphinium 6.0 – 7.5
  • Dianthus 6.0 – 7.5
  • Flame Grass 5.0 – 7.5
  • Forsythia 6.0 – 8.0
  • Foxglove 6.0 – 7.5
  • Gardenia 4.5 – 7.5
  • Ginger 5.0 – 8.0
  • Geranium 6.0 – 8.0
  • Gladiola 6.0 – 7.0
  • Gypsophilia 6.0 – 7.5
  • Honey Suckle 5.5 – 8.0
  • Hibiscus 5.0 – 8.0
  • Holly 5.0 – 6.5
  • Hyacinth 6.5 – 7.5
  • Iris 5.0 – 6.5
  • Ixora 5.0 – 8.0
  • Jacaranda 6.0 – 7.5
  • Lantana 5.5 – 7.0
  • Lavender 6.5 – 7.5
  • Lilac 6.0 – 7.5
  • Magnolia 5.0 – 7.0
  • Marigold 4.5 – 7.5
  • Nasturtium 5.5 – 7.5
  • Oleander 6.0 – 7.5
  • Orchid 4.0 – 5.0
  • Pansy 5.5 – 7.0
  • Petunia 6.0 – 7.5
  • Pincushion Flower 6.0 – 7.5
  • Poppy 6.0 – 7.5
  • Portulaca 5.5 – 7.5
  • Primrose 5.5 – 6.5
  • Roses 5.5 – 7.0
  • Salvia 6.0 – 7.5
  • Snapdragon 5.5 – 7.0
  • Sunflower 5.0 – 7.0
  • Sweet Pea 6.0 – 7.5
  • Sweet William 6.0 – 7.5
  • Tulip 6.0 – 7.0
  • Virginia Bluebell 6.5 – 7.5
  • Viola 5.5 – 6.5
  • Wallflower 5.0 – 8.0
  • Zinnia 5.5 – 7.5

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