📌 Quick Summary: “All Leaves, No Crown”
- 🌡️ The Heat Factor: Broccoli is notorious for refusing to head up during sudden heatwaves. If your region had a scorching late spring, the plants often stall. Heads usually start forming once the rains and cooler weather roll in.
- 🌱 Root Shock: Starting broccoli seeds in a community flat and tearing the roots at transplant is a classic mistake. Always use individual seed-starter cells.
- ✂️ The Emergency Fix: If your plant is a giant bush with absolutely no central bud forming, chop the top center off! This breaks apical dominance and forces the plant to shoot out multiple smaller side florets.
Good evening, everyone!
I’m having an issue-my broccoli just isn’t forming heads. I was so happy with my crop last year, so I’m a bit bummed out this time around.
On another note, I planted pumpkins and labeled everything perfectly, but half of them grew into zucchini and the other half into pumpkins! The seeds were from Brizhan.
My potatoes grown from seed are looking great, though I haven’t dug them up to taste yet. I also planted a ton of garlic this year, various varieties, including a “village” heirloom-that one was the very first to send up scapes.
Evening photo: My rose bush.
T
gala7496 wrote:
my broccoli just isn’t forming heads.
Same here!
I’m honestly kicking myself for even bothering with cabbage and broccoli this year. When are they actually supposed to start heading up anyway? 🐕
Tatka wrote:
When are they actually supposed to start heading up anyway?
They should be forming heads by now. I already know what Luda is going to say–I followed all her tips from last year to the letter. Honestly, I think it just boils down to the seed quality.
Tatka wrote:
When are they actually supposed to start heading up anyway?
Tanya! Let’s troubleshoot and see if something went sideways.
Here is what broccoli really needs:
- Pro-grade seeds for spring/summer growing. If your Mays are hot, you absolutely need heat-tolerant hybrids.
- Starts grown in their own individual cups/plugs.
- Pest treatment before you transplant them out.
- The planting hole needs to be heavily amended (compost, a balanced granular fert, and wood ash).
- Heavy feeding for the first 6 weeks. Alternate nitrogen and balanced NPK so the plant pushes about 2 new leaves every single week.
- Steady watering – not soaking wet, but frequent enough to keep it constantly moist.
- The end goal: You shouldn’t have a little plant, but a monster bush. It needs to be about 20 inches (50 cm) tall and just as wide, with at least 14 to 16 leaves. (Mine got even bigger than that this year).
If you checked all those boxes, then the only culprit left is that crazy heat we had in May.
If there is no embryo of a head forming in the center, you need to cut off that spot and force the plant to push out side shoots. Also, if the bushes look wimpy, give them a feed.
gala7496 wrote:
Honestly, I think it just boils down to the seed quality.
Galya, in my experience, the seed determines how big the head gets, but not whether it forms at all. That is, if they are pro seeds. If they are just cheap retail packets, then all bets are off.
What brand were the seeds?
Aleksan9ra wrote:
If you checked all those boxes, then the only culprit left is that crazy heat we had in May…
Thanks so much, Luda! My bushes are actually massive, the holes were prepped, the ground is always moist, and I fed them right on your schedule.
BUT… I didn’t treat them for bugs before transplanting, and my starts weren’t in individual cups – they grew in a community flat.
I sprayed them with a Valerian root extract to keep pests away, but it wore off and I totally missed the flea beetles moving in. They shot my leaves full of holes! I eventually hit them with Fitoverm (a biological pesticide), but it rained right after, so who knows if it worked.
Also, the temperatures in May were higher than I can ever remember.
Aleksan9ra wrote:
What brand were the seeds?
I bought them online from the “Sady Rossii” (Gardens of Russia) catalog.
Aleksan9ra wrote:
…the only culprit left is that crazy heat we had in May.
My heads only started forming once the rains finally came! But yeah, the bushes themselves grew completely huge.
👨🔬 Editor’s Botanical Note: Heat, Roots, and “Blind” Broccoli
This thread highlights two massive pitfalls when growing broccoli: Heat Stress and Root Disturbance.
1. The “Blind” Broccoli (Heat Stress):
Broccoli is a cool-season brassica. If young plants are hit by prolonged high temperatures (above 80°F / 27°C) before they mature enough to form a crown, they can go “blind.” The heat damages the central apical bud, and it stops developing. As LavandaN noted, the heads often magically appear once a cool rain front moves in. If your broccoli goes blind, Ludmila’s advice is spot on: chop the top center out! This breaks apical dominance and tells the plant to push out side-shoots (florets).
2. The Community Flat Mistake:
Tatka noted she grew her seeds in a community flat (a large, open tray) rather than individual cell plugs. Broccoli roots absolutely hate being disturbed. Pulling them apart from a community flat causes transplant shock. The plant responds by delaying head formation or producing tiny, premature “button” heads. Always start your brassicas in individual plug trays!
