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Hortimix Nutrient Preparation and Usage Table

Hortimix Nutrient Preparation and Usage Table

Mix 525g of Part A with 5 liters of fresh water in a container, label and shake until dissolved.

Do the same with the 350g of Part B in another 5 liter container, label, and shake well.

Monopotassium phosphate, MKP, KH₂PO₄ – Mix 125g in 5L of water and the follow attached table.

Store in a cool dark place.

Follow Feeding schedule on page 2 for the correct dosage or follow the instructions below to use the solutions you have made to feed your plants!

During the vegetation cycle always use equal quantities of both Part A and Part B nutrient to reach the required E.C. value. One week into the flowering cycle, 20% of the required volume of Part A should be replaced with MPK. This value can gradually increase to 40% by volume in the case of large plants. The E.C. values on the table are calculated using 1 liter of pH balanced water as the measuring standard with a base E.C. of less than 0.1.

The values are estimations only and this table can be used as a general guide.

When making up the nutrients solution, you should add the nutrients and adjust the pH afterwards with the pH Up or PH Down to get the desired pH of between pH 5.5 – 6.5. Avoid using pH Up and pH Down too many times in one solution as this can cause the pH to become unstable.

Schedule to be used as a weekly Feeding schedule.

It is best to give the plants new water and Nutrients at each stage (week).

Alternatively, you could use an EC Meter.

An EC meter measures the electrical conductivity in the water (the amount of nutrients), then you can adjust the water/Nutrients to the correct EC per growing Stage.

Lettuce can handle a maximum EC of about 1.2. Therefore you would not go beyond an EC of 1.2 for Lettuce, you would continue feeding the same amount of Nutrients for an EC of 1.2 for each additional week that your plants are in your system.

Tomatoes can handle an EC of 2 to 5, therefore you can go right to the end of the Feeding schedule and beyond (increasing in same increments). Try grow plants with similar EC and pH range. If you are growing for example, Lettuce and Tomatoes together, harvest your lettuce before you increase nutrients to a higher range otherwise your lettuce will get Nutrient burn (edges of leaves brown) if the Nutrient level is too high.

Please see optimum pH and EC readings for various types of plants and vegetables on our website Click on the heading ‘Hydroponics’ and then on Plant PH/EC/PPM’.

Never mix the nutrients together in their concentrated form, as this will cause nutrient “lock-out” making some minerals unavailable. It is best to begin by adding Nutrient A, stirring well, and then Nutrient B and stir well etc

Recommended feeding Schedule and Estimated E.C. Values

Amounts below per 1 liter of water:

  Part A Part B MPK E.C. Recommended Feeding
Week 1 1 ml 1 ml 0.2 Established Seedlings
Week 2 2 ml 2 ml 0.4 These values are good for advanced seedling stage and also for early clones
Week 3 3 ml 3 ml 0.6
Week 4 4 ml 4 ml 0.7
Week 5 5 ml 5 ml 0.8
Week 6 6 ml 6 ml 1.0 Good values for full growing and early flowering
Week 7 7 ml 7 ml 1.1
Week 8 6 ml 8 ml 2 ml 1.2
Week 9 7 ml 9 ml 2 ml 1.3 These values are for mid flowering stages
Week 10 7 ml 10 ml 3 ml 1.4
Week 11 8 ml 11 ml 3 ml 1.5
Week 12 8 ml 12 ml 4 ml 1.6
Week 13 9 ml 13 ml 4 ml 1.7 Full flowering will require even greater nutrition but always monitor carefully
Week 14 9 ml 14 ml 5 ml 1.8
Week 15 10 ml 15 ml 5 ml 1.9
Week 16 11 ml 16 ml 5 ml 2.0

 Enjoy Growing!

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We are growing!

We are proud to announce that has merged with Hortishop, for whom we’ve been a re-seller for the last 3 years. We will now be handling online orders for Hortishop.

Hortishop has recently been through a restructuring process and due to the success of they have incorporated us as their e-commerce provider.

What does this mean for our customers?

The only change is that our Banking details will be changing to:

Windell Hydroponics t/a
CHEQUE ACCOUNT NO: 62074133655
BRANCH CODE: 210655 (Willowbridge)

We also now have credit/debit card facilities at the Durbanville shop 🙂

Otherwise, it’s business as usual. Megan will still be running the online and Durbanville branch.
(please note the trading hours for Durbanville branch).

Tues: 9am – 5pm
Thur: 9am – 5pm
Sat: 9am – 1pm

If you have any queries regarding this merger, please contact us.

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Postal Strike Update

While the strike is over, SAPO still has a huge backlog of parcels that need to be processed and they expect to have that completed by January.

Once we have confirmation that they are operating at normal capacity we will turn on the Post Office and Speed Courier shipping methods.

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July 2014 Special

For one day only –  all orders over R 1000.00 we’ll give you a 15% discount if you use the following coupon code on checkout…


This offer is only valid until the end of July 2014.

Get you all your hydroponics supplies now!

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Debit card and Bitcoin now accepted

We are happy to announce that we now accept both Debit Cards and Bitcoin payments via Payfast. It is even easier now to purchase you hydroponic supplies online.

Bitcoin is a software-based payment system described by Satoshi Nakamoto in 2008, and introduced as open-source software in 2009. Payments are recorded in a public ledger using its own unit of account, which is also called bitcoin. Payments work peer-to-peer without a central repository or single administrator, which has led the US Treasury to call bitcoin a decentralized virtual currency. Although its status as a currency is disputed, media reports often refer to bitcoin as a cryptocurrency or digital currency.

From Wikipedia

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Our new DWC system

After 6 months of testing and tweaking this system, we’re finally ready to put it up for sale.

This system is not imported from China (although some of the components are) and is made locally.

There are a couple of features that makes our version of a Deep Water Culture different from the the others on the local market.

– circulation outlet within the reservoir.
– top fed nutrient supply
– easy access for nutrient management and water top up.
– built in water level.

This hydroponic system allows you to put seedlings directly into the unit which will decrease the time to harvest substantially by giving it nutrient from day one. With other systems, you’d need to wait for the roots to be long enough to reach the nutrient solution.

Look out for the larger reservoir version launching later this week which will only hold 2 plants, but in larger net pots.