Bloom Ultra 1L yellow bottle, kelp and alfalfa flower enhancer by Bloom Advanced Floriculture

Ultra by Bloom — Kelp and Alfalfa Flower Enhancer for the First Two Weeks of Bloom

BLOOM-ULTRA-5

$799.95
/
Tax included. Shipping calculated at checkout.

Kelp and alfalfa flower enhancer for the first two weeks of bloom. 1ml per litre for an even transition across the canopy.

Size
  • Handpicked by growers
  • Ships today
  • Real advice, real people
  • 6,596+ high-yielding customers
  • 30-day returns*
  • Free shipping over $499*
  • Low stock - 1 item left
  • Backordered, shipping soon

Pairs well with

The first two weeks after you switch to your flowering light schedule decide how much the plant can carry later. Ultra by Bloom is a kelp and alfalfa flower enhancer for exactly that window: run at 1ml per litre in weeks 1–2 of flower, it helps the whole canopy transition together, sets flower sites early and keeps the stretch tighter. A litre makes 1,000 litres of feed, and it runs on top of your base nutrients. Genetics and lighting still decide most of the stretch, so treat Ultra as a nudge in the right direction, not a height limiter. Hand over to Phat in week 3.

An even transitionHelps the whole canopy move into flower together, with fewer lagging tops.
Sites set earlyFlower sites form early and together instead of the plant running to leggy stem.
Tighter stretchKeeps structure tighter through the transition, so energy goes into sites rather than height.
A two-week jobWeeks 1–2 of flower only, then Phat takes over in week 3.
1 litre makes 1,000 litresAt 1ml per litre, one bottle covers a lot of transitions.
Sits on top of your baseNo need to cut back your base nutrients to run it.

Specifications
Brand: Bloom (Agricultural Organics)
Type: Flower enhancer
NPK: 0.0331 - 0 - 0.2289
Key inputs: Ascophyllum nodosum kelp, Medicago sativa (alfalfa) extract, which naturally carries triacontanol, humic acid, vitamin B1
Rate: 1ml per litre
When to use: Weeks 1–2 of flower, every feed
Yield: 1L makes 1,000L of feed at 1ml/L
Concentrate pH: 8–10 (alkaline)
Suits: Soil, coco, recirculating hydro, run-to-waste; indoors or outdoors
Sizes: 300ml, 1L, 2.5L, 15L, 25L
Made in: South Australia
Biodegradable: Yes, 100% (manufacturer)

Grower's Tip
  • Start Ultra with the first feed after you switch to your flowering light schedule. The timing matters more than the dose.
  • Stop after week 2 and move to Phat for weeks 3–4. Ultra is built for the transition only.
  • Don't double the rate chasing a shorter plant. Stretch varies a lot by variety, and Ultra nudges it rather than stopping it.
  • Add Ultra with your other nutrients and adjust pH last. The concentrate is alkaline.
  • Shake well before use. Colour and consistency vary a little between batches, which is normal.
  • Bloom's full flower sequence runs Ultra in weeks 1–2, Phat in weeks 3–4, Ooze from week 5 and Final in the last two weeks.

How To Use It
1Shake the bottle well.
2With the first feed after switching to your flowering light schedule, add 1ml per litre to your nutrient solution alongside your base nutrients.
3Mix thoroughly, then check and adjust pH last.
4Feed as normal at every watering through weeks 1–2 of flower.
5From week 3, stop Ultra and move on to Phat.

Pairs Well With

Frequently Asked Questions
When do I start Ultra?

With the first feed after you switch to your flowering light schedule. Run it at 1ml per litre for weeks 1–2 of flower.

Will Ultra stop my plants stretching?

No, not completely. It's designed to keep the stretch in check and the structure tighter, but genetics and lighting still decide most of it.

What comes after Ultra?

Phat in weeks 3–4 of flower, Ooze from week 5, and Final in the last two weeks, if you're running Bloom's full program.

Is Ultra a plant growth regulator?

No. It's a kelp and alfalfa biostimulant, and Bloom states its products contain no banned plant growth regulators.

Do I need to cut back my base nutrients?

No. Bloom designs its additives to run alongside your base feed at its normal rate, so you add Ultra on top rather than in place of anything.

Can I use Ultra outdoors or in soil?

Yes. Bloom lists it for any grow method or medium, indoors or outdoors, at the same 1ml per litre.

How long does a bottle last?

A litre makes 1,000 litres of feed at 1ml per litre. The 300ml makes 300 litres.

Is it certified organic?

No. Bloom makes the range mostly from organic sources, but the products are not certified organic, so we don't sell them as organic.

Select Size

Get the Flip Right From Day One

Free shipping over $499* on bottles up to 2.5L. 15L and 25L drums ship at freight rates.

This site is protected by hCaptcha and the hCaptcha Privacy Policy and Terms of Service apply.

Growers First, Retailers Second

Welcome to The Grow Guys

We built The Grow Guys from the soil up — well, coco and perlite. Before we sold gear, we bought it, ran it, and learned the hard way what's worth the money and what ends up in the shed. That's the filter everything on our shelves passes through. No sales scripts, no rebadged junk, no telling you what you want to hear. Just gear we'd run ourselves and advice from people who actually grow. Chasing higher yields, tighter flowers, or your first harvest? You're in the right place.

Meet The Grow Guys

FAQs

How fast do you ship?

Order by 2pm and it ships the same business day from Invermay, Tasmania.

How much is shipping?

Calculated at checkout by weight and destination. Free shipping over $499*.

Is the packaging discreet?

Plain packaging, no branding. No one knows what's in your box.

What's your returns policy?

30-day change-of-mind returns on unopened, unused products. A 10% restocking fee applies and return shipping is at your cost.

Can I get advice before buying?

Call, email, or walk into the Invermay shop. You'll get a grower on the other end, not a script.

Do you have a physical store?

Unit 10/110 Gleadow Street, Invermay 7248. Mon–Fri 8:30am–5:30pm, Sat 9am–3pm.

Inside The Grow Guys hydroponics store in Invermay, Tasmania

Still got a question?

Talk to a grower, not a script

Tell us your space and what you want to grow. We'll point you to the gear that fits, and tell you what you can skip.

Call 0481 735 126

Mon–Fri 8:30am–5:30pm · Sat 9am–3pm

You may also like

Recently viewed

Back to New Arrivals