Craig Dremann's TOP 99 ARIZONA SOIL NUTRIENT and
ORGANIC MATTER THRESHOLDS for native grass seedlings
with data links, including some of the food plants for wildlife,
rangeland forage, and wildflowers for native pollinators.

The Reveg Edge, P.O. Box 361, Redwood City, CA 94064

Copyright © 2018 by Craig C. Dremann - 650-325-7333 - email

No links = Thresholds that still need to be determined, using the Waypoint Lab A-17 soil test plus an A-19-2 organic matter test that are run from the top 2 inches of soil taken from next to seedlings of each species, and then tests run, data only, in a bar graph format.

A second soil sample is taken from bare soil within 10 feet of the first sample, to confirm the threshold levels set by the first soil sample. Each soil sample needs to be a one-quart ziplock bag full, which has been sifted through a inch mesh screen to remove any rocks or vegetation matter.

Waypoint Lab protocols and the sample form to send in with the soil samples for the A-17 and A-19-2 tests, can be downloaded at

Waypoint Lab: 4741 East Hunter Ave., Suite A
Phone: (714) 282-8777

Links below, are the test results for the soil nutrient and organic matter thresholds that are needed for seedling survival for each species.

Bold = Suggested first test subjects.

! = Pseudomonas bacteria host plant, that help create the rain clouds--see Discover Magazine 2012 article

Achnatherum hymenoides

Achnatherum lemmonii

Achnatherum lettermanii

Achnatherum nelsonii

Achnatherum robustum

Achnatherum speciosum

Agrostis exarata

Agrostis gigantea

Agrostis idahoensis

Agrostis scabra

Aristida adscensionis

Aristida arizonica

Aristida divaricata

Aristida fendleriana

Aristida havardii

Aristida purpurea

Aristida schiedeana

Aristida ternipes

Bouteloua aristidoides

Bouteloua barbata

Bouteloua chondrosioides

Bouteloua curtipendula

Bouteloua dactyloides

Bouteloua eriopoda

Bouteloua gracilis

Bouteloua hirsuta

Bouteloua rothrockii

Bouteloua simplex

Bromus anomalus

Bromus arizonicus

Bromus marginatus

Bromus porteri

Digitaria californica

Digitaria sanguinalis

Distichlis spicata

Elymus canadensis

Elymus condensatus

Elymus elymoides

Elymus glaucus

Elymus trachycaulus

Elymus virginicus

Eragrostis cilianensis

Eragrostis curvula

Eragrostis intermedia

Eragrostis mexicana

Eragrostis pectinacea

Eragrostis spectabilis

Eragrostis superba

Festuca arizonica

Festuca californica

Hesperostipa comata

Hesperostipa neomexicana

Hilaria belangeri

Hordeum brachyantherum

Koeleria macrantha

Leymus cinereus

Leymus triticoides

Melica porteri

Muhlenbergia appressa

Muhlenbergia arenicola

Muhlenbergia asperifolia

Muhlenbergia brevis

Muhlenbergia depauperata

Muhlenbergia dumosa

Muhlenbergia emersleyi

Muhlenbergia fragilis

Muhlenbergia longiligula

Muhlenbergia mexicana

Muhlenbergia microsperma

Muhlenbergia minutissima

Muhlenbergia montana

Muhlenbergia pauciflora

Muhlenbergia porteri

Muhlenbergia ramulosa

Muhlenbergia repens

Muhlenbergia richardsonis

Muhlenbergia rigens

Muhlenbergia sinuosa

Muhlenbergia torreyi

Muhlenbergia wrightii

Pleuraphis jamesii

Pleuraphis mutica

Pleuraphis rigida

Poa bigelovii

Poa fendleriana

Schizachyrium cirratum

Schizachyrium sanguineum

Schizachyrium scoparium

Sporobolus airoides

Sporobolus contractus

Sporobolus cryptandrus

Sporobolus flexuosus

Sporobolus giganteus

Sporobolus interruptus

Sporobolus wrightii

Urochloa arizonica

Urochloa maxima

Vulpia microstachys

Vulpia octoflora


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Updated January 1, 2019