How to improve my farm.- help with waterflow as well.

Hi there I recently built a new farm. But I have a few questions about a few things. and I am open to suggestions on to how to improve it. Here are a few pics.


These are my 3 rows for crops. I am considering making the middle one sugar cane,and the far right one cactus.
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The block shown here, when destroyed, will release a water source block which then flows and is set to expand to flow over 1 of the 3 fields effectively farming the crops it flows on.

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These next 3 pics are where the crops SHOULD flow but I haven't been able to get them to flow properly without getting stuck on one of the blocks. So help with understanding water flow please
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This final pic is showing that I added a wall to keep spiders from climbing into the farm after one climbed over the fence while I was taking pics, and decided to trample some of my crops while I beat it with a stick...
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Thank you for your time and help. Xbot668

Hey u can have a look at my farm. Its a lot smaller but its more efficient. I use the secret door rune to hold water from the source block and once activated, the water will flow out and automatically harvest the crops. I have also got a collection stream to collect the wheat. Have a look at these pics
[url=[You must be registered and logged in to see this link.]]view from above[/url]

[url=[You must be registered and logged in to see this link.]]water controlled automatic harvesting system[/url]

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and finally overview of me and my friends castle click it if u want to see
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Im sure you can improve this design by simply making it longer. I also have water source blocks on the sides to make the wheat grow faster. the farm currently yields 30 wheat each time