saving seeds ~ agrariana
TRANSCRIPT
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Saving Seeds
Photo: Stephen Loewinsohn (stephenloewinsohn.com)
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Why Save Seeds?
DiversityLandrace crops
Commercial Extinction
Extirpation
History
Thriftiness
Community
Genetics
Memory
Aesthetics
Politics
BotanicalCuriosity
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Relax!
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Angiosperms
Flowering plantsMost diverse group of land plantsTogether with gymnosperms are the seed- producing plantsBegan separating from gymnosperms 200 million y/a, first flowering 140 million y/a, widespread 100 million y/a, dominant trees 60 million y/aDistinguished from gymnosperms by flowers, endosperm within seed, production of fruit
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Pollination
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Perfect (Bisexual) Flowers
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Unisexual Flowers
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Flowers?
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Vegetative plant propagation
BulbsTuber cuttingsDivisionCuttings and graftings
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Pollination Methods
Self-pollinated– Inbreeders - have enclosed flowers
which almost always self-pollinate.
Insect-pollinated– Self-sterile/Self-incompatible
Insect-pollinated - Honeybees, bumblebees, sweat bees, wild solitary bees, moths, butterflies, wasps, flies
Wind-pollinated
Outbreeders
or cross-pollinators
Perf
ect
Flow
ers
Uni
sexu
al
Flow
ers
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Break
Find examples of perfect and unisexual flowers.Find examples of crops without readily visible
flowers.Are there any non-angiosperms in the garden?
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Scientific names(Linnaean Taxonomy)
Family
Genus
species
var. variety ‘Cultivar’
Variety - often occur in nature and most varieties are true to type
Cultivar – (CULTIvated VARiety) selected and cultivated by humans, not necessarily true to type
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Family Apiaceae Daucus carota var. sativus ‘Scarlet Nantes’
Family Cucurbitaceae Cucumis sativus ‘Parisian Pickling’
Family Cucurbitaceae Cucumis melo var. cantalupensis ‘Hearts of Gold’
Family Brassicaceae Brassica oleracea cultivar group Capitata‘Brunswick’
Family Brassicaceae Brassica oleracea cultivar group Italica‘Romanesco Italia’
Family Solanaceae Solanum lycopersicum ‘Cherokee Purple’
Family Solanaceae Capsicum annum ‘Charleston Belle’
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Pea Family (Fabaceae or Leguminosae)
Level: BeginnerMembers:
Phaseolus vulgaris – common beanP. coccineus – runner beanPisum sativum – pea
Flower: PerfectPollination: SelfHarvesting:
– Dry bean pods on plant– Split from pod
Photo: Stephen Loewinsohn (stephenloewinsohn.com)
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Nightshade Family (Solanaceae)
Level: Beginner
Members: Capsicum annuum – peppersLycopersicon lycopersicum – tomatoSolanum tuberosum – potato
Flower: PerfectPollination: SelfHarvesting:
– Collect mature fruit– Semi-wet or wet
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Sunflower Family (Compositae or Asteraceae )
Level: BeginnerMembers:
Lactuca sativa – lettuceCynara scolymus– artichokeCichorium endivia – endive
Flower: PerfectPollination: Self w. insectsHarvesting:
– Dry seeds on plants– Hand thresh– Winnow or screen
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Gourd Family (Cucurbitaceae)
Level: Intermediate/BeginnerMembers:
Cucumis melo – muskmelon, cantaloupe, honeydew
Cucumis sativus– cucumberCucurbita pepo – acorn squash, zucchini
Flower: UnisexualPollination: InsectsHarvesting:
– Commonly hand pollinated– Collect mature– Ferment, wash, and dry
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Parsley Family (Umbelliferae or Apiaceae)
Level: Intermediate Members:
Apium graveolens – celeryAnethum graveolens – dillDaucus carota – carrotFoeniculum vulgare – fennel
Flower: Perfect, outbreedingPollination: InsectHarvesting:
– Carrot, celery, fennel are biennial– Collect dry seed heads– Pick seeds out
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Goosefoot Family (Chenopodiaceae)
Level: IntermediateMembers:
Beta vulgaris – beet, Swiss chardSpinacia oleracea– spinachChenopodium quinoa – quinoa
Flower: Perfect, not selfPollination: WindHarvesting:
– Biennials – Collect dry seeds– Thresh and winnow
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Allium Family (Amaryllidaceae)
Level: IntermediateMembers:
Allium ampeloprasum - leeksA. cepa – onionsA. Sativum - garlic
Flower: PerfectPollination: InsectHarvesting:
– Biennial – Usually plant bulbs– Seeds form on flower in 2nd year of growth
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Mustard Family (Brassicaceae or Cruciferae)
Level: Intermediate/AdvancedMembers:
Brassica juncea – mustard greensB. oleracea– broccoli, cauliflower,
cabbage, Brussels sprouts, kale, collards, kohlrabi
B. Rapa – turnip, broccoli raab
Flower: Perfect, self-sterilePollination: InsectHarvesting:
– Cool climate biennials – Collect dry seeds
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Grass Family (Poacea or Gramineae)
Level: Advanced for cornEasy for others
Members: Zea mays – corn
Triticum aestivum - wheat
Flower: Unisexual Pollination: Wind
Harvesting: – Dry on plant– Thresh– Winnow
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Other Families
Amaranthaceae – amaranthBasellaceae – malabar spinachConvolvulaceae – sweet potatoLiliaceae – asparagusMalvaceae – okraPolygonaceae – Rhubarb, sorrelPortulacaceae – miner’s lettuce
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Break
Find examples of as many crop families as possible.
Find examples of crops that look different but are of the same genus or same species.
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Heirlooms
Open-Pollinated - The pollination of outbreedingplants by insects, birds, wind, or other natural processes. – self pollination of inbreeders
– controlled pollination to maintain a variety
A variety/cultivar developed and commonly grown earlier in history– how long?
– may or may not have a story
– not used in industrial agriculture?
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HybridsF1 hybrid - the offspring of a cross between two parent plants of different varieties
– 'first filial' generation– creates new desired traits, most notably hybrid vigor – done under controlled conditions, often by hand, which makes F1
hybrid seed more expensive to produce– cross the F1 generation with itself you get an F2– accused of being a form of biotechnology to control seed savers
Hybrid vigor (heterosis) - If you cross two different varieties of an outbreeding plant, the offspring may well turn out bigger, faster-growing, or more productive than either of the parents. Hybrid vigor may not be passed on to the F2 generation.
F2s can be saved - you are staring a breeding trial
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Isolation by Distance
Isolation Distances – The minimum planting separation required between two or more varieties of the same species for the purpose of keeping seed pure.
Consult tables
Isolation distances often for open farmland, high humidity – may be modified for arid West and heterogeneous urban locales
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Advanced IsolationTimeMechanical– Bagging
– Blossom taping
– Caging
– Alternate day caging
– Caging with pollinators
Hand pollination
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Population Size
Never < 6 individuals
Recommended:– Inbreeders – 20 individuals– Outbreeders – 100 individuals
Inbreeding depression - If an outbreeding plant self-pollinates, the offspring can turn out weaker and slower-growing than either parent, and it gets worse with each subsequent generation.
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Selection
TastePhysical characteristics: Color, Size, ShapeDisease resistance: blight, rust, wilt, …Drought toleranceVigor/PerformanceMarket concerns: easy harvest, shipability
RoguingTrueness-to-type
Characteristics
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Garden Planning
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Garden Planning
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Break
Catalog your current garden or plan a future plot.
Catalog or plan a section of the student garden.
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Mature Seeds
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Processing – Basic Dry MethodsDry on plant, between screens, or hang inside
Winnowing/Gravity
ScreeningThreshing
Picking seeds – beans, peas, corn, many herbs
Seeds with chaff – lettuce, grains
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Processing – Basic Wet Methods
Semi-wet – peppers – pick seeds, rinse, and dry
Wet – tomatoes, melons, squash, cucumber– ferment, wash, then dry
Pick fully mature specimens
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http://www.youtube.com/watch?v=g0Uq9E7qruc
Seed Processing: Part 1
By South Bay seed saver Bill Merrill (www.greengardenservice.net)
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Seed Processing: Part 2
http://www.youtube.com/watch?v=gbLpIQrAa_8
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http://www.youtube.com/watch?v=YnpWSfzWCxk
Seed Processing: Part 3
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StorageStore seed at maximum dry weight ≈ 8% seed moisture. Check for breaking or shattering.General rule: sum of temperature and relative humidity < 100Paper envelopes are great to hold and sort seedsContainers must be air tight – glass jars, paint cans, plastic containers w. gaskets. Some people add silica dessicant.Store in a cool, dry, dark location, such as a closetNewbie mistake: seed that molds was not sufficiently dry before storage. Consult tables for storage times for viable seed. Germination rates must remain above 70%.
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Advanced Storage
Long term frozen storage at low moisture.– At home
– Germplasm collections
– Seed vaults
Overwintering biennials
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Record Keeping
Metadata is important!! Make sure you label all the containers or packages with at least the seed variety/cultivar, date collected, and source
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Bay Area Seed Interchange Library (BASIL)
Located in the Ecology Center2530 San Pablo Ave (near Dwight)Berkeley, CA 94702Tuesday - Saturday, 11:00 a.m. - 6:00 p.m.www.ecologycenter.org/basil
BASIL is a free, community-based, urban seed project committed to disseminating and celebrating local varieties of seed stock and raising awareness about the importance and relationship between biological and cultural diversity.
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Richmond Grows
Richmond Public Library325 Civic Center PlazaRichmond, CA 94804
www.richmondgrows.org
Pocket Seed Librarywww.pocketseedlibrary.comHosts picnics and seed swaps
Baker Creek Heirloom Seeds
www.rareseeds.com
Seed Bank in Petaluma
Seed Savers Exchange
www.seedsavers.org
Seed Sources We Like
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Further ReadingFree Resources:
McCormack, Jeffrey. (2004). Isolation Distances. Saving Our Seeds. http://www.savingourseed.org/Survey/IsolationGuideSurvey.html
McCormack, Jeffrey. (2004). Seed Processing and Storage. Saving Our Seeds. http://www.savingourseed.org/Survey/SeedProcessingandStorageSurvey.html
McDorman, Bill. (1994). Basic Seed Saving. International Seed Saving Institute http://www.seedsave.org/issi/issi_904.html
Native Seeds|SEARCH. Seed Saving How To. http://www.nativeseeds.org/how_to/seedsave
If you read one book on seed saving:
Ashworth, Suzanne. (2002). Seed to Seed: Seed Saving and Growing Techniques for Vegetable Gardeners. Seed Savers Exchange. Decorah, Iowa.
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Created by Mat Rogers
for Agrariana (www.agrariana.org)
Photo: Stephen Loewinsohn (stephenloewinsohn.com)