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Vegetable Critical Dates (Zone 6b)
Last Frost: May 15
First Frost: Oct 15
Persephone: Nov 10
SPRING
Feb 15 — Slow Roots: Seed Onions, Leeks, Celeriac
Mar 1 — Early Greens: Seed Spinach, Lettuce, Brassicas
Mar 15 — Hardy Veg: Direct Sow Peas, Spinach, Radish
Apr 1 — Warm Crops: Seed Tomatoes, Peppers, Eggplant
Apr 15 — Cole Crops: Transplant Broccoli, Cabbage, Kale
Apr 25 — Vine Crops: Seed Cukes, Squash, Melons
May 22 — MAIN PLANTING: All Tender Crops
SUMMER
May 15 — Long Fall Crops: Seed Brussels Sprouts
Jun 15 — Fall Storage: Direct Sow Winter Squash, Pumpkins
Jun 20 — Fall Brassicas: Seed Cabbage, Broccoli, Cauli
Jul 15 — Fall Brassicas: Transplant to Field
WINTER PREP
Aug 1 — Storage Roots: Direct Sow Carrots, Beets
Aug 15 — Overwinter Onions: Seed Bridger, T-448
Aug 15 — Tunnel Greens: Seed Kale, Chard, Collards
Sep 1 — Winter Roots: Last Daikon/Turnip Sow
Sep 7-10 — Winter Spinach: Direct Sow Tunnel
Sep 15 — Tunnel Greens: Transplant Now!
Oct 1 — Overwinter Onions: Transplant to Field
Oct 15 — Garlic: Plant Hardneck (at first frost)
Winter Success Rules
1. Size before darkness: Crops must be at target size by Nov 10 (Persephone)
2. Spinach penny rule: Plants must be silver-dollar size by Thanksgiving
3. Airflow beats heat: Vent early, vent often. Row cover adds degrees; humidity subtracts quality
Right Now
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Log Cover Crop Planting
Welter Seed Order (2026)
welterseed.com · 800-470-3325 · Use *Org versions (NOP required)
ORDER NOW — Spring (seed Apr 1–20)
Certified Organic Jerry Oats — 3 x 32lb bu @ $12.75 = $38.25
Certified Organic 4010 Peas — 3 x 50lb @ $36.50 = $109.50
Certified Organic 4010 Peas — 3 x 50lb @ $36.50 = $109.50
Subtotal: $147.75
ORDER MAY — Summer (seed Jun 1–Jul 15)
Certified Organic Buckwheat — 2 x 50lb @ $56.00 = $112.00
Subtotal: $112.00
ORDER JUL/AUG — Fall (seed Aug 15–Oct 5)
Winter Rye Grain *Org — 5 x 56lb bu (~$18/bu) = ~$90
Certified Organic Hairy Vetch — 2 x 50lb @ $147.00 = $294.00
Crimson Clover w/Nitro-Coat — 1 x 50lb @ $81.00 = $81.00
Certified Organic Hairy Vetch — 2 x 50lb @ $147.00 = $294.00
Crimson Clover w/Nitro-Coat — 1 x 50lb @ $81.00 = $81.00
Subtotal: ~$465.00
Full Season Total
~$725–$875
Phacelia: source from Johnny's Selected Seeds (not at Welter)
Active Cover Crop Plantings
0 fields| Field | Mix | Acres | Seeded | Terminate By | Follows With | Status |
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Species Quick Reference (Welter Seed)
All *Org versions required for USDA NOP compliance. Prices from Welter Seed welterseed.com
| Species | Type | Seed Window (Zone 6a) | Rate (lbs/ac) | Overwinters? | Welter Price | Pollinators | Key Benefit |
|---|---|---|---|---|---|---|---|
| LEGUMES — Nitrogen Fixers | |||||||
| Hairy Vetch *Org | Winter Annual | Aug 1 – Sep 15 | 20–25 | Yes | $147/50lb ($2.94/lb) | High | 60–120 lbs N/ac; mix with rye |
| Spring Peas *Org | Annual | Mar–Apr 20 / Aug–Sep | 60–75 | No | $36.50/50lb ($0.73/lb) | Moderate | 30–60 lbs N/ac; mix with oats |
| Winter Peas *Org | Winter Annual | Mar–Apr / Aug–Sep | 30–40 | Partial | $42/50lb ($0.84/lb) | Moderate | More cold-hardy than spring peas |
| Red Clover *Org | Biennial/Perennial | Feb–Apr / Aug–Sep | 10–14 | Yes | $230/50lb ($4.60/lb) | High | Frost-seed into rye in March |
| Crimson Clover (Nitro-Coat) | Annual | Mar–Jun / Aug–Sep | 20–30 | No | $81/50lb (Nitro-Coat Org) | High | Conv seed/OMRI coating; overseed into brassicas |
| NON-LEGUMES — Soil Builders & Weed Suppressors | |||||||
| Winter Rye *Org | Winter Annual | Aug 1 – Oct 15 | 70–80 (1.25 bu) | Yes | ~$18/56lb bu (confirm) | None | Best soil builder; always mix with a legume |
| Spring Oats *Org | Annual | Mar 20 – Apr 20 / Aug–Sep | 64–96 (1.5–2 bu) | No (winter-kills) | $12.75/32lb bu ($0.40/lb) | None | Ideal pre-brassica; light spring residue |
| Buckwheat *Org | Summer Annual | Jun 1 – Aug 1 | 50 | Frost-killed | $56/50lb ($1.12/lb) | Premier | Fills Jul–Aug nectar gap. Mow at 50% bloom! |
| Daikon Radish *Org | Annual | Feb–Apr / Aug–Sep | 10–12 | Frost-killed | $3.40/lb (bulk) | High | Breaks compaction; add to cocktail mixes |
| Annual Ryegrass *Org | Annual | Feb–Apr / Aug–Sep | 25–40 | Sometimes | Contact Welter | None | Erosion + N scavenger; hard to terminate |
NOP Compliance: Since Welter carries certified organic seed for all primary species, you must use *Org versions under USDA NOP 205.204. Document any exceptions. Do NOT use brassica cover crops (radish, mustard, turnip) on fields with brassica cash crops.