Answer: humus

AnswerCrossword Clue
HUMUSGardeners need "a sense of ..."
humusthe dark organic material in soils, produced by decomposing matter
humusa brown or black complex variable material resulting from partial decomposition of plant or animal matter and forming the organic portion of soil
humusdecomposed organic matter
HUMUSOrganic component of soil
HUMUSPartially decomposed organic matter
HUMUSSoil's decaying matter
HUMUSRich soil part
HUMUSSoil's organic decaying matter
HUMUSFertile soil ingredient
HUMUSRich soil component
HUMUSSoil improver
HUMUSOrganic part of soil
HUMUSGardener's gold?
HUMUSPart of fertile soil
HUMUSFlowerpot must
HUMUSRich soil
HUMUSFertilizer.
HUMUSWhat a gardener must have a sense of.
HUMUSOrganic part of soil.
HUMUSSoil component
HUMUSOrganic fertilizer
HUMUSOrganic portion of soil
HUMUSForest floor, in part
HUMUSMature compost
HUMUSSoil enricher