I learned that in this experimint Mom's soil needs way more alkali if she wants
to grow the Day lilys.
A pH scale tells us how acidic or alkaline something is. The initials pH stand for Potential of Hydrogen. Acids on a pH scale are under 7 and alkalis are over 7 on a pH scale. 7 is neutral, neither acidic or alkaline. The pH scale tells us how much  acid or alkali are in something. The more acid the further down the pH scale it is. You can adjust the pH  in your soil by adding more lime stone if you want to make it alkali. If you want to make it more acid, add more potassium.
Some plants that like alkaline soil are:
Asperula
Asphodoline
Buphthalum
Camassia
Canna
Catalpa
Corydalis
Cosmos
Cottoneaster
Crocus
Day lily
Snowdrop
Tamarix
Wistaria
Mint

Some plants that like Acidic soil are:
Sage
Soybean
Celery
Venus Flytrap
Camelia
Watermelon
Huckleberry
Melon
Apple
Bayberry
Broom
Cardinal Flower
Butterfly Bush
Spruce

Some plants that are neutral are:
Sweet pea
Foxglove
Sun flower
Beans
Horseradish
Cress
Forget-Me-Nots
Afican Violet
Calla Lily
Shrimp Plant
Dogwood
Snapdragen
Roses
Moring Glory
Strawberrys
Tulip
Rye

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