It is necessary to get a good supply, and pick off the
green heads, with four or six inches only of stem; wash them clean,
and throw them into the tank, without planting. They spread over the
surface, forming a rich green ceiling, grow freely, and last for months.
They are continually throwing out new roots and shoots, and create
abundance of oxygen. Whenever desired, they can be got rid of by simply
lifting them out.
The _Vallisneria_, or Tape-Grass, common in all our ponds, is essential
to every fresh-water tank. It must be grown as a bottom-plant, and
flourishes only when rooted. The _Nitella_ is another pleasing variety.
The _Ranunculus aquatilis_, or Water-Crowfoot, is to be found in almost
every pond in bloom by the middle of May, and continues so into the
autumn. It is of the buttercup family, and may be known as a white
buttercup with a yellow centre. The floating leaves are fleshy; the
lower ones finely cut. It must be very carefully washed, and planted
from a good joint, allowing length enough of stem to reach the surface.
Some of the blossom-heads may also be sprinkled over the surface, where
they will live and bloom all through the summer. The _Hydrocharis_,
or Frog's-Bit, and the _Alisma_, or Water-Plantain, are also easily
obtained, hardy and useful, as well as pleasing.
Pages:
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215