Jobes tomato spikes about once a month is good enough for my lilies. I give each pot 2 spikes. They bloom until the end of September.

Is your pond lined? Are your lilies in containers? If so, I have mine in round containers about 18" in diameter and about 7" deep and I put 3 pond tabs in every 3-4 weeks. It will help with the blooms.
We'd enjoy some pics sometime!

I use Pondtabbs about once per month

i also use pond tabs about once per month once a week sounds kind of too often they are heavy feeders but that seems like quite abit of fertilizer there is something that i remember someone telling me that too much fertilizer in the pond at one time can do your fish grave harm even kill them sorry about the bad news but if you have ten plants to feed you might want to space the feeding time depending on the size of your pond

If you use a real pond plant tablet made for ponds, fertilize them according to the directions, you'll have lots of blooms, and it won't hurt your fish even if you fertilize them all at once. I have 25 or more lilies (2 tabs a month) and 5-6 lotus(at 4 tabs a month)in my pond and no problems. I fertilize all of them at the same time.
If you use something else, then with 10 lilies you might have problems with your fish and that's because you're not using something made for the pond.

There is no difference between pond tabs and other fertilizers such as Jobe's tomato spikes other then they jack up the price because they are "for ponds"

Many, many people use Jobe's with great results for far less money.

It isn't just people on this board but on every pond board I've ever been to.

Depends on what "pond plant" fertilizer you're using. Many of the pond specific tabs do not have the level of phosphates that Jobe's tomato spikes do and that is what promotes blooming.
Therefor, the pond specific fertilizer might be o.k. to use weekly or according to directions.
I wouldn't use the Jobe's tomato spikes more than every 30 days.

I meant no difference in safety for the fish. Using Jobe's tomato spikes instead of pond tabs won't hurt your fish!

It is true that many pond fertilizers promote green growth or root growth with high nitrogen or potash instead of phosphorus which promotes blooms.

Thank you for posting the info concerning those strange numbers that appear by law on every package of fertilizer. It is gardening 101 for many of us but new and surprising to others. There are many sites that can explain in great detail what the numbers mean but a simple explanation might prevent some bad habits. It might remind some of us who have forgotten, as well.
There are a few things that can affect the way the fertilizer is used by the plants or how the plants are affected by the fertilizer that should be part of any fertilizer lesson. I hope you won't mind if I mention them without going into such things as cations.
Fertilizer is fertilizer but there is a big difference between 10-10-10 and 4-26-00 and 4-26-4. The first is a standard fertilizer that is sufficient for plants in normal, balanced soils and without special needs. The second number is a fertilizer designed to produce healthy flowers with a minimum of foliage, and doesn't add additional nutrients for strong stems and roots. A third number, 4-26-4 is a better choice since it serves all of your flowering plant's requirements. If you don't know if your soil is properly balanced, a soil test through your local Cooperative Extension or a testing lab is a good investment. For water gardens and ponds you can use the numbers given by your water test kit. If you have fish, the test kit is very important as the presence in large quantities of some elements can harm or kill your fish and plants as they build up in the soil and water. These chemicals can give your plants a chemical burn that will show up as brown, dead edges or distinct leaf yellowing and bud loss. The gills of your fish may become inflamed and sores can develop.
Pond water is usually somewhat alkaline. This is normal and healthy for fish and most aquatic plants. However, water with a high PH, alkaline in other words, reduces the ability of plants to use nitrogen. Sulphur as a source changes that. If you are using a fertilizer with sulphur in the ingredients you are getting the best use of the fertilizer and not overloading the water with chemical elements that are not useful and can be harmful.
Some judgement is necessary in fertilizing your pond since there are variations in the amount of water circulating, algae growth, sunlight, the number of fish and their waste and any excess fish food in the system. All of those can have an affect on your plants. You may need to juggle the amount and type of fertilizer to match the needs of your pond. Start with a good fertilizer for aquatic plants and watch the affect on your plants over time. Adjust the amount of specific nutrients as needed.
I'm sure there is other information that can be added by some one. Sandy