Update - on Top dressing
Greetings 420 enthusiasts! This update is to detail what I did last time compared to this grow for my own reference when my next grow rolls around so I know what the hell I did!
Top dressing strategy on my previous grow
I started my grow last year with the hope that I could manage the whole grow without any top dressing and just give waterings with worm wee added. However, as my outdoor grows are vegged for up to 3 or 4 months and then flowering on top of that, the plants are grown for up to 7 months or more. On last year's grow in early February, one single plant started showing lower leaf yellowing and I gave it a top dressing that consisted of;
- 1/4 cup Blood n Bone
- 1/3 cup Fish Meal
- 3 tablespoons Neem powder
- 1 cup diastatic Malted Barley
- 6-8 cups Worm Castings
That plant responded well. Then after a few more weeks the other 2 plants showed lower yellowing that indicated that they could also benefit from a topdressing, which I gave them also, but I thought at the time it probably would have been better if I'd done so a bit earlier because top dressings take a little bit of time to get taken into the soil. However, as I noted above, my view was coloured a bit by being somewhat single minded in my hope that I could carry out a water only LOS grow.
Top dressing strategy for this grow
So based on past experience, I have accepted that my containers are probably a bit too small to carry out 7+ month grows with water only. So my thoughts for this time was to carry out the top dressing based on the timing shown previously. And also, I thought this time I would 'trickle top dress' them, i.e. give them several smaller top dressings rather than one larger one. However, I have revised that intention to now just give them one further top dressing that will hopefully be all that I need to give them. My reason for only one more top dressing which I have given today, is that this top dressing should supply them with all they need now until harvest time, and plus, in the second half of flowering I want to apply some 'drought stress' treatment to the plants, for this reason I don't want the plants to suddenly show me at that point they need further top dressing because if I am droughting them I don't want to break drought treatment to water in a top dressing application. I should point out that when outdoor growing, drought treatment is very dependent on what the weather gods bring, so if they push the 'rain button' then my draughting intentions will not work.
So, here is the top dressing that I have given my plants this grow;
1st topdressing - 20 January 2022
- 2 tablespoons Blood n Bone
- 2 tablespoons Neem powder
2nd topdressing 2 weeks later - 3 February 2022
- 2 Tablespoons Blood n Bone (1/8 cup)
- 2 Tablespoons Fish Meal(1/8 cup)
- 2 tablespoons Guano Phosphate(1/8 cup)
- 2 tablespoons Seafood Lush Fert Mix(1/8 cup)
- 2 tablespoons Kelp meal(1/8 cup)
- 2 tablespoons Neem Powder(1/8 cup)
- 2 tablespoons Diatomaceous Earth/Silica(1/8 cup)
- 1/2 cup rough ground diastatic malted barley
<edit> The above quantities are for the smaller 30L (13 gallon) containers. I added a bit extra for the larger 50L (13 gallon) containers.
All the best folks, thanks for dropping by!