Pac Choi 'Rosie' F1 New · Sep 2026

This group (mizuna, pac choi varieties Rosie F1, Baby Choi, and Prize Choy, and mustards Ruby Streaks, Red Giant, and Southern Giant) follows the same fall-through-spring rhythm as the other greens in Decatur, sown in September for a winter harvest and again in February-March before spring heat pushes them to bolt, but several of these mustards will happily reseed themselves if you let a plant flower.

1. 1

   Sowing

   Early-mid September (fall crop) or mid-February to early March (spring crop)

   You'll see Seeds are small and round, reddish-brown for mustards and pac choi, and show nothing above ground for several days after sowing.

   Do Direct sow 1/4 inch deep, or start pac choi varieties in cell trays for a head start, and keep the surface consistently moist.

   Details
2. 2

   Seedling

   Days 4-18 after sowing

   You'll see Round seed leaves appear first, then true leaves show each variety's character: mizuna's deeply feathered leaf, pac choi's smooth spoon shape, and the mustards' ruffled, sometimes reddish-purple edges (Ruby Streaks and Red Giant color up early, even as seedlings).

   Do Thin to 4-6 inches apart for mizuna and mustards, 6-8 inches for pac choi, and watch for flea beetle shot-holes.

   Details
3. 3

   Transplant

   3-4 weeks after starting indoors, when seedlings have 2-3 true leaves

   You'll see Transplant-ready pac choi seedlings are compact, 2-3 inches tall, with a small but well-formed rosette and a root ball that holds together.

   Do Harden off over 5-7 days, then set plants at the same depth they grew, spaced 8-10 inches apart for pac choi in beds or grow bags.

   Details
4. 4

   Cut-and-come-again harvest

   Starting 25-40 days after sowing, continuing 4-8 weeks

   You'll see Leaves reach 4-8 inches, with pac choi forming a loose vase-shaped rosette and mustards and mizuna forming a spreading clump of individual leaves.

   Do Harvest outer leaves first, or shear the whole plant an inch above the crown for a quick regrow.

   Details
5. 5

   Bolting

   Late spring, typically May, once daylength lengthens and temperatures push past 75-80°F

   You'll see A central stalk shoots up, leaves become sparse and pointed, and small yellow four-petaled flowers cluster at the top, a classic mustard-family (Brassica) bloom.

   Do Harvest what you can before leaves turn bitter, then either pull the plant or leave a few to flower for pollinators and seed.

   Details
6. 6

   Seed saving

   4-8 weeks after bolting, once seed pods dry from green to brown

   You'll see Flower stalks turn from bright yellow blooms to slim, brown, brittle pods that rattle with seed when dry.

   Do Cut dry seed stalks into a paper bag, finish drying, then crush and winnow to collect seed; note which varieties are worth saving.

   Details

Techniques — transplant, prune, propagate, divide, seed